Guadalupe Murrelet or Craveri's Murrelet?

Guadalupe Murrelet Recognition Guide

Guadalupe Murrelets are small seabirds known for their sleek black and white plumage. The upper parts of the bird, including the back and wings, are dark grey to black, providing excellent camouflage against the ocean. Their underparts are bright white, creating a stark contrast with their dark upper plumage. These murrelets have a short, pointed bill and relatively small wings, suited for both flying close to the water's surface and underwater diving. Their legs and feet are set far back on their body, which is advantageous for swimming but gives an awkward gait on land. There are no noticeable differences in plumage between male and female Guadalupe Murrelets, making sex identification challenging based solely on appearance. Both genders share identical coloration and markings throughout the year. Juvenile Guadalupe Murrelets differ from adults primarily in the subtlety of their plumage. Young murrelets tend to have softer and slightly duller coloration on their upper parts, with less defined contrast between the dark and light areas. As they mature, their plumage develops the sharper color contrasts characteristic of adults, aiding in camouflage and courtship displays during breeding seasons. Observing these birds in the wild involves looking for their distinct flying pattern, close to the water, and listening for their vocalizations, especially during twilight when they are most active.

Primary habitat

The Guadalupe Murrelet primarily inhabits the open ocean near its breeding grounds, the islands off Baja California, Mexico. They favor areas with cold currents that facilitate an abundant food supply, such as small fish and plankton. Typically, these birds nest in rocky crevices or under dense vegetation on remote islands, preferring undisturbed environments.

Additional range

While generally associated with the Pacific Ocean around their breeding sites, the Guadalupe Murrelet can occasionally be sighted in slightly warmer waters or further offshore during migration. They adapt to varying sea surface temperatures, demonstrating resilience in diverse marine conditions.

Natural Diet

The Guadalupe Murrelet, primarily found along the Pacific Ocean near Guadalupe Island, has a diet that primarily consists of small fish and marine invertebrates. These agile birds are adept divers, using their wings to propel themselves underwater to capture prey. Small schooling fish like sardines and anchovies are favored when abundant. Additionally, the murrelet consumes crustaceans and other small sea creatures. Seasonal variations in diet can occur, relying more heavily on crustaceans when small fish are scarce during certain periods.

Bird Feeders

While the Guadalupe Murrelet is not typically a species that visits bird feeders, should they wander into human-inhabited areas, they may exhibit interest in food items reminiscent of their natural diet. Offering small fish or krill in areas close to their natural habitat could theoretically attract them. However, due to their reliance on marine environments and diet specialization, they are not known to adapt readily to typical bird feeder offerings such as seeds, suet, or fruits. Providing a habitat that replicates their natural coastal habitat would be more beneficial for conservation efforts.