Eastern Tropical Pacific Killer Whales
A field guide to one of the least-understood killer-whale communities on Earth—tropical predators ranging from Pacific Mexico toward Central and South America.
Search known IDs, places, prey species or major research events.
Orcas in tropical water
Most of what the public knows about killer-whale culture comes from cold-water populations with decades of continuous observation. The Eastern Tropical Pacific is different. Encounters are scattered across an enormous ocean region, and many individual whales have historically been photographed only once.
Researchers now use “Eastern Tropical Pacific” for a broad region beginning around southern Baja California and extending toward northern Peru, including offshore waters. The whales within that region are not yet resolved into a single universally accepted population structure.
What is becoming clearer is that at least some whales around Pacific Mexico differ from the well-known high-latitude ecotypes. Their morphology, group structure, movements and extraordinarily broad prey choices have led researchers to propose a distinct tropical ecotype—and possibly one or more distinct tropical populations.
Dorsal-fin shape, saddle patches and scars help researchers compare individual tropical killer whales across rare encounters.
Individuals represented in the 2008 NOAA Eastern Tropical Pacific photo-ID catalogue.
Total travel recorded from three satellite-tagged whales in Pacific Mexico during the 2025 study.
Share of tracked time those whales spent within 50 km of shore.
Maximum dive recorded during the first high-resolution tropical killer-whale movement study.
For the first time, researchers followed them
In February 2025, three members of a seven-whale group in Bahía de Banderas were fitted with satellite tags. Until then, tropical killer-whale movement was known mostly through rare photographic resightings.
The results changed the picture. During tag deployments lasting 8 to 41 days, the whales traveled about 4,002 km while repeatedly moving along a roughly 1,000-km corridor of the Mexican coast. They remained mostly nearshore but were capable of moving far offshore and diving hundreds of meters.
Researchers also documented an extraordinary range of prey and interactions during the study: a humpback calf, a dwarf sperm whale, bottlenose dolphins, spinner dolphins and sea turtles. That diversity strongly supports the idea of a tropical generalist ecotype rather than the narrow prey specialization familiar from many temperate killer-whale populations.
Generalists—with specialists inside the culture
The strongest emerging pattern is dietary breadth. Across the region, killer whales have been documented attacking prey from several completely different branches of the marine food web.
From dolphins to great whales
Documented prey or attacks include dolphins, dwarf sperm whales, humpbacks, Bryde’s whales, fin whales and a blue-whale calf.
A growing predation record
Gulf of California observations include whale sharks, bull sharks, rays and more recent interactions with juvenile white sharks.
Generalist does not mean identical
Whales such as Moctezuma and the large-whale hunters E256 and E261 suggest that particular individuals can develop specialized techniques within a broader generalist population.
More than one ID system
NOAA’s Eastern Tropical Pacific catalogue uses E-numbers such as E059, E256 and E261. Regional projects use additional systems: Southern California observers use identifiers such as ETP-14 and ETP-17, while Gulf of California researchers also use names such as Moctezuma, Quetzalli, Niich and Waay.
Why multiple IDs appear
The same whale can exist in several regional photo-ID catalogues. E256, for example, has also been listed as ME87, MX87 and UABCS_Oo_M_077. Cross-matching these systems can reveal movements that no single local catalogue could show alone.
Regional names need context
Not every nickname or regional ETP number is part of NOAA’s historical E-number catalogue. This guide keeps the identification system attached to its source and avoids treating unverified relationships or cross-matches as settled fact.
Science in motion
This is not yet a population catalogue like the Southern Resident or Bigg’s guides. The 195 whales in the public 2008 NOAA catalogue are photo-identified historical records, not a current abundance estimate, and the region’s social structure is still being resolved.
A 2026 Central Tropical Pacific study compared Hawaiian killer whales with two Eastern Tropical Pacific photo-ID catalogues totaling 810 individuals. Because the newer research catalogue is not presented as a public life-history directory, this WUTA page does not attempt to reproduce all 810 whales. Instead, it highlights publicly identifiable individuals, regional groups and published research records while keeping uncertain relationships clearly labeled.
Meet the whales we can follow
This living directory brings together publicly identifiable whales from the Gulf of California and Southern California with NOAA E-number matches, historical groups and major research records. It is intentionally not presented as a complete census of every killer whale in the Eastern Tropical Pacific.
01 E059 / E060 / E061 NOAA ID group
Research & identification notes
- These three whales were part of NOAA catalogue group 25.00 off Cabo Corrientes, Mexico, in August 2000.
- They were photographically matched again off Guatemala in December 2011—about 1,778 km away and 11 years later.
- E060 was identified by two dorsal-fin notches, E061 by a distinctive saddle pattern, and E059 by a beveled dorsal-fin tip.
- The long-term match provides rare evidence of persistent social association among tropical killer whales.
02 E256 Known adult male
Research & identification notes
- E256 has been cross-matched under several regional catalogue systems, including ME87, MX87 and UABCS_Oo_M_077.
- He has been photographed repeatedly around Baja California and was involved, alone or with E261, in multiple documented fin-whale kills.
- The repeated records suggest a large-whale-hunting specialization within at least part of his social network.
03 E261 Known adult male
Research & identification notes
- E261 was photographed in the Gulf of California in 2006 and has also been cross-matched as MX157 and UABCS_Oo_M_089.
- He was later identified in Southern California waters, making him an important link between Baja / Gulf records and the waters off San Diego and nearby Southern California.
- E261 was involved in several documented fin- and Bryde’s-whale attacks along Baja California.
04 Moctezuma Gulf of California male
Research & identification notes
- Moctezuma is a large adult male first documented in 1992 in the Gulf of California.
- He has been repeatedly associated with predation on elasmobranchs, including Munk’s pygmy devil rays and whale sharks.
- A 2024 whale-shark study identified him in three of four documented predation events and described a possible specialized elasmobranch-hunting social group.
05 Quetzalli Gulf of California female
Research & identification notes
- Orcas Mexico identifies Quetzalli as an adult female monitored since she was a juvenile.
- Published Cabo Pulmo shark-predation research identifies Quetzalli as part of the Gulf of California elasmobranch-eating group with Niich and Waay.
- Her repeated identification helps connect long-term Gulf photo-ID monitoring with specific hunting traditions.
06 Niich Gulf shark hunter
Research & identification notes
- Niich is one of the individually identified females in the Gulf of California elasmobranch-hunting group.
- Published work describes a wide notch above the center of her dorsal fin as a useful identification feature.
- She has been matched across shark- and ray-predation events, including earlier ray hunting and later shark interactions.
07 Waay Gulf shark hunter
Research & identification notes
- Waay is another individually identified member of the Gulf of California elasmobranch-hunting group.
- Researchers describe the more rounded top of her dorsal fin as an identification feature.
- She has been photo-identified in shark-predation observations alongside other members of the Quetzalli / Niich social group.
08 Southern California ETP group Recurring regional group
Research & identification notes
- California Killer Whale Project confirms that multiple killer-whale groups from the Eastern Tropical Pacific have been documented entering California waters.
- A 2024 Southern California regional photo-ID guide tracks a recurring group of ten named whales: Kali, Nicki, Top Notch, Diego, Luna, Cookie, Coronado, Ana, Navi and Terso.
- This group has been repeatedly encountered in Southern California, including the San Diego region, and has been documented hunting dolphins.
- Regional ETP numbers and nicknames are kept separate here from NOAA’s historical E-number catalogue unless a published cross-match exists.
09 ETP-14 — Kali Southern California ID
Research & identification notes
- The 2024 Southern California ETP guide lists Kali as a female regional ID.
- Her first known sighting in that regional record was in 2018.
- She is frequently documented with Nicki, Top Notch, Coronado and Cookie when the group is in Southern California.
10 ETP-15 — Nicki / Baja Nicki Southern California ID
Research & identification notes
- The regional Southern California guide lists Nicki, also called Baja Nicki, as an adult female.
- Regional ID material traces her identification history back to 2008.
- She is commonly associated with Kali, Top Notch, Coronado and Cookie during Southern California encounters.
11 ETP-17 — Top Notch Southern California female
Research & identification notes
- Top Notch is an adult female named for a conspicuous notch near the top of her dorsal fin in the regional Southern California ID guide.
- The regional guide identifies Coronado and Cookie as her calves.
- Her group has been repeatedly documented in Southern California, including dolphin-hunting encounters off San Diego; Top Notch was again documented hunting common dolphins there in November 2024.
12 ETP-18 — Diego Southern California ID
Research & identification notes
- Diego is listed as a male in the Southern California regional ID material and was first known there as a young calf in 2018.
- He is usually documented with Luna, Ana, Navi and Terso.
- Luna is considered a possible mother in the regional guide, but that relationship should remain labeled as probable rather than confirmed.
13 ETP-19 — Luna Southern California female
Research & identification notes
- Luna is an adult female in the Southern California regional ID guide and was first known there in 2018.
- She is frequently associated with Ana, Navi, Diego and Terso.
- The regional guide treats Luna as the possible mother of Diego and Terso; those relationships are not presented here as confirmed.
14 ETP-20 — Cookie Southern California calf
Research & identification notes
- Cookie is a female born in late 2023 in the Southern California regional record.
- The regional guide identifies Top Notch as her mother and Coronado as an older sibling.
- Her nickname refers to a prominent cookiecutter-shark bite scar used in regional identification.
15 ETP-21 — Coronado Southern California male
Research & identification notes
- Coronado is a male first documented as a calf with Top Notch in 2021.
- The Southern California regional guide identifies Top Notch as his mother and Cookie as a younger sibling.
- He is commonly documented with Top Notch, Kali and Nicki during Southern California encounters.
16 ETP-22 — Ana Southern California female
Research & identification notes
- Ana is an adult female first documented in the Southern California regional record in 2018.
- The regional guide identifies Navi as her calf.
- She is commonly associated with Luna, Diego, Terso and Navi.
17 ETP-23 — Navi Southern California calf
Research & identification notes
- Navi is a male born around late 2023 in the Southern California regional record.
- The regional guide identifies Ana as his mother.
- He has been repeatedly documented traveling with Ana and the Luna / Diego / Terso cluster.
18 ETP-24 — Terso Southern California ID
Research & identification notes
- Terso is one of the ten named whales in the 2024 Southern California ETP regional guide.
- Terso is frequently documented with Luna, Ana, Diego and Navi.
- Regional sources have proposed a close family relationship with Luna and Diego, but this guide keeps that relationship unresolved unless stronger pedigree evidence becomes available.
19 Historical L.A. Pod Historical California–Mexico group
Research & identification notes
- California researchers historically tracked a distinctive group called the L.A. Pod, composed of at least 13 whales in late-20th-century records.
- NOAA-era California work documented members from the Sea of Cortez north to Monterey, with later summaries extending records to the Farallon Islands.
- The L.A. Pod is historically important to the California–Mexico killer-whale story, including the famous 1997 white-shark predation by CA2.
- This guide does not assume the historical L.A. Pod is the same social group as the modern Southern California ETP group without a documented photo-ID or genetic cross-match.
20 NOAA Group 25.00 Long-term social group
Research & identification notes
- Group 25.00 consisted of seven killer whales photographed off Cabo Corrientes, Mexico, in August 2000.
- At least three adults from this group—E059, E060 and E061—were matched in Guatemala 11 years later.
- The match is one of the strongest published examples of long-term group cohesion and large-scale movement in the Eastern Tropical Pacific.
21 Bahía de Banderas tagged group 2025 satellite study
Research & identification notes
- In February 2025, researchers satellite-tagged three whales from a group of seven in Bahía de Banderas, Mexico.
- The tags transmitted for 8 to 41 days and together documented about 4,002 km of travel along roughly 1,000 km of coastline.
- The whales spent 92.5% of their tracked time within 50 km of shore and 69% of their time in water shallower than 500 m.
- The deepest recorded dive reached 528 m.
22 Costa Rica Dome blue-whale hunt Predation record
Research & identification notes
- On September 26, 2003, researchers encountered an estimated 19 killer whales feeding on a blue-whale calf about 230 km west of Nicaragua.
- The encounter lasted about 2.5 hours and produced photographs, genetics, acoustic recordings and behavioral observations.
- It remains one of the most important scientific records showing coordinated great-whale predation by tropical killer whales.
23 Baja fin-whale hunters Predation record
Research & identification notes
- A 2023 synthesis documented multiple fatal killer-whale attacks on fin whales around Baja California.
- Two recognizable males—E256 and E261—were involved separately or together in at least four of five documented Baja fin-whale kills.
- The same males were also linked to Bryde’s-whale kills, suggesting a possible large-whale-prey specialization within their social networks.
24 Manzanillo whale-shark pair Predation record
Research & identification notes
- On March 28, 2021, two adult female killer whales were filmed attacking a juvenile whale shark about 24 km off Manzanillo, Colima.
- The whales repeatedly struck the shark’s ventral region before consuming it.
- Their visible morphology was consistent with features described for proposed Eastern Tropical Pacific tropical killer whales.
25 Gulf of California shark hunters Predation culture
Research & identification notes
- Killer whales in the Gulf of California have been documented hunting rays, whale sharks, bull sharks, prickly sharks and juvenile white sharks.
- Named individuals including Moctezuma, Quetzalli, Niich and Waay provide evidence that at least some shark- and ray-hunting traditions are concentrated within particular social networks.
- This creates an important contrast with the broad regional pattern: the proposed tropical ecotype appears generalist overall, while individual groups can still develop strong prey specializations.
26 Clipperton offshore group NOAA research group
Research & identification notes
- NOAA’s 2008 catalogue recorded E226 and E228–E231 west of Clipperton Island in August 2006.
- This offshore record helps demonstrate that Eastern Tropical Pacific killer whales are not exclusively nearshore animals.
27 Peru offshore group NOAA research group
Research & identification notes
- NOAA catalogued E232–E237 west of Peru in October 2006.
- Records this far south are part of the evidence behind the broad working definition of the Eastern Tropical Pacific from southern Baja California toward northern Peru, including offshore waters.
28 Guatemala killer whales Central America record
Research & identification notes
- Published Guatemalan records include groups containing adult males, females or younger whales and calves.
- A 2020 sighting in the San José Canyon involved an estimated 10–15 animals.
- The E059 / E060 / E061 match between Mexico and Guatemala demonstrates that at least some tropical killer whales move across large stretches of the eastern Pacific while maintaining social associations.
29 195-whale NOAA catalogue Public photo-ID archive
Research & identification notes
- The public 2008 NOAA Eastern Tropical Pacific photo-identification catalogue contains 195 individual killer whales.
- The catalogue was built from opportunistic photographs collected during NOAA surveys spanning decades.
- A 2026 study compared Hawaiian whales against two ETP catalogues totaling 810 individuals, illustrating how much larger the research photo-ID record has become.
- Catalogue size should not be interpreted as a current abundance estimate.
Where the facts come from
This WUTA guide is independently written and summarizes published research rather than reproducing a scientific catalogue.
- NOAA — Killer Whales of the Eastern Tropical Pacific: Photo-ID Catalogue
- NOAA / SWFSC — Killer Whales of California, including historical L.A. Pod records
- California Killer Whale Project — California ecotypes and ETP visitors
- Southern California ETP Killer Whales — 2024 regional photo-ID guide
- Orcas Mexico — Gulf of California photo-ID, Moctezuma and Quetzalli
- Frontiers 2024 — Cabo Pulmo shark predation; Quetzalli, Niich and Waay
- Frontiers 2024 — Whale-shark predation and the Moctezuma group
- Vargas-Bravo et al. — Proposed Eastern Tropical Pacific ecotype
- Stewart et al. 2026 — Satellite-tagged killer whales in Pacific Mexico
- Hill et al. 2026 — Central Tropical Pacific comparison and 810-individual ETP catalogue context
- Pitman et al. — Blue-whale-calf predation on the Costa Rica Dome
- Pitman et al. 2023 — Fin-whale predation around Baja California
- Revista de Biología Tropical 2023 — Guatemala records and E059 / E060 / E061 photo match
The terms ecotype, population and stock are not interchangeable. Southern California nicknames and ETP-14–ETP-24 identifiers are regional photo-ID labels rather than NOAA E-numbers; family relationships from that guide are described cautiously where they remain proposed. Formal management and taxonomic conclusions should be taken from the newest primary research and government assessments.
