Hydrobates socorroensis
The Townsend's Storm Petrel (Hydrobates socorroensis) is a diminutive and enigmatic seabird, characterized by its uniformly sooty-brown plumage, a subtle pale carpal bar on the upper wing, and a short, square-tipped tail. Measuring approximately 18-19 cm in length with a wingspan of 32-35 cm and weighing 28-35 grams, it is among the smaller members of the Hydrobatidae family. Distinguishing field marks include its overall dark appearance and the absence of a white rump, which differentiates i...
Exclusively pelagic, inhabiting vast stretches of the open eastern Pacific Ocean, only returning to remote, predator-free volcanic islands for breeding. Breeding colonies are established on steep, rocky slopes and cliffs.
Feeds primarily on small marine invertebrates such as crustaceans (copepods, amphipods) and squid, along with larval fish and zooplankton. It forages by surface-skimming and foot-pattering over open ocean waters.
Townsend's Storm Petrel exhibits a predominantly nocturnal activity pattern at its breeding colonies on Socorro Island, an adaptation to avoid predation by gulls and other aerial predators. At sea, it is highly pelagic, often seen skimming the ocean surface with fluttering wings, employing a char...
The Townsend's Storm Petrel is an extreme endemic, breeding solely on Socorro Island, the largest island within Mexico's Revillagigedo Archipelago, approximately 600 kilometers southwest of Baja California. After the breeding season, these birds disperse widely across the eastern Pacific Ocean. T...
Critically Endangered
- The Townsend's Storm Petrel is critically endangered, with an estimated global population of only 1,000-2,500 mature individuals. - It breeds exclusively on Socorro Island, part of Mexico's Revillagigedo Archipelago, making it one of the most geographically restricted seabirds. - This species s...