Common dolphins travel in groups of hundreds, sometimes thousands, and love to race in and ride a boat’s bow wave. The Gulf of California holds the largest common dolphins known anywhere.
A slim dolphin with a sharp beak and a crisscross “hourglass” on each side: dark gray cape on the back, a yellowish-tan patch in front of the dorsal fin and pale gray behind it, with a white belly. The tall dorsal fin often has a lighter center. The long-beaked form has a longer beak and a dark stripe from the mouth toward the flipper that makes its face look darker.
Two forms live in Mexican waters. The long-beaked common dolphin of the eastern Pacific stays within about 185 km of the coast, from central California to just south of the tip of Baja and throughout the whole Gulf of California. It was long called Delphinus capensis, but the Society for Marine Mammalogy no longer recognizes that species and lists it as the subspecies D. delphis bairdii; a 2024 study argues it should be its own species, D. bairdii. The short-beaked form is more oceanic and is widespread in the eastern tropical Pacific. Around Los Cabos both are possible, but the dolphins near the coast and inside the Gulf are mostly long-beaked.
They hunt schooling fish such as sardines and anchovies, plus squid, often diving at night. They’re fast, acrobatic and social: they leap clear of the water at speed, somersault and ride boat bow waves for long stretches. In the eastern tropical Pacific, short-beaked common dolphins travel with tuna schools and seabird flocks, the association that once made them a bycatch of the tuna fleet.
The “long-beaked common dolphin” used to be a separate species worldwide. Scientists found that long beaks evolved independently in different oceans, so the Society for Marine Mammalogy dropped Delphinus capensis and keeps Baja’s form as a subspecies.
Source ↗Gulf of California long-beaked dolphins are the largest Delphinus ever measured: up to 2.52 m for females and 2.65 m for males.
Source ↗In 1986, tuna purse seiners in the eastern Pacific killed an estimated 24,307 common dolphins. In 2023, under the dolphin program run by the IATTC, the estimate was 62.
Source ↗In 2016 a hybrid calf was born in the Bay of Algeciras, Spain, to a female bottlenose dolphin that had spent about 10 years living with common dolphins. It has a bottlenose’s body and a common dolphin’s crisscross pattern.
Source ↗The first description of long-beaked common dolphin whistles from the Gulf of California, recorded in La Paz Bay in 2020–21, analyzed 270 whistles ranging from 2.6 to 26 kHz.
Source ↗Common dolphins usually feed at night around 30 m deep, but they can dive to about 300 m.
Source ↗Common dolphins are seen year-round off Los Cabos, both on the Pacific side and toward the Sea of Cortez, and local reports describe superpods of hundreds to thousands of dolphins off Cabo, leaping and churning the water for hundreds of meters; according to the same reports, birds and feeding dolphins can also mean bait and predators nearby.
Enjoy them from the boat: keep a steady course and speed, let them choose to ride the bow, don’t drive through or split up a pod, and never feed them or try to swim with them. Keep lines and lures clear when a pod is around.
| Mexico (NOM-059) | Subject to special protection (Pr), both the long-beaked and short-beaked forms |
|---|---|
| Ley General de Vida Silvestre, art. 60 Bis | No extractive use or possession of any marine mammal, except authorized research and conservation |
| Whale-watching rules (NOM-131) | Do not apply: NOM-131 covers only baleen whales and the sperm whale |
| Tuna fishery | Dolphin mortality in eastern Pacific purse seining is monitored under the IATTC’s International Dolphin Conservation Program |
| IUCN Red List | Least Concern (2021) |
The bottlenose dolphin is bigger and plain gray, with a short, thick beak and no hourglass pattern. The spinner dolphin has a very long, thin beak and a three-tone pattern and spins in the air, while the pantropical spotted dolphin has spots and a white-tipped beak.
Yes, year-round. Local reports describe pods of hundreds or even thousands.
The long-beaked form is bigger, has a longer beak and a darker face, and stays near the coast; it’s the one that lives throughout the Gulf of California. The short-beaked form is more oceanic.
Globally they are Least Concern on the IUCN Red List, but in Mexico both forms are subject to special protection (Pr) under NOM-059, and no marine mammal may be captured or kept.
Top illustration: Top Anglers. Photos: iNaturalist contributors, credited on each photo.
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