Black Storm-Petrel
Hydrobates melania
Large, dark, angular storm-petrel with a deeply notched tail. Looks long-necked and large-billed. Paler brown upperwing band is usually rather faint and does not reach the leading edge of the wing. Typical flight style is smooth and powerful with deep wingbeats. Uncommon from central California to Peru, often in mixed flocks with other species of storm-petrel. Compare with dark-rumped Leach's and Ashy Storm-Petrels, but note flight style, overall shape, and large bill. Also very similar to Markham's Storm-Petrel, which overlaps offshore Middle and South America. Black is bulkier and larger-billed, with a duller upperwing band, and is usually found closer to shore than Markham's.
Identification
The black storm petrel (Hydrobates melania) is a small seabird of the storm petrel family Hydrobatidae. It is 23 cm in length, with a wingspan of 46–51 cm.
Taxonomy
Genus: Hydrobates; Family: Hydrobatidae; Order: Procellariiformes.
- Scientific name
- Hydrobates melania
- Authority
- (Bonaparte, 1854)
- Order
- Procellariiformes
- Family
- Hydrobatidae
- Genus
- Hydrobates
Range and habitat
Breeding range: PO : Channel Is. (w of s California), Is. de San Benito (w of c Baja California), Roca Consag, Isla San Luis, Isla Partida and Isla Cardonosa Este (e of n, nc, c Baja California, Gulf of California). Non-breeding range: coastal e Pacific waters n to c California and s to n Peru.
- Breeding range
- PO : Channel Is. (w of s California), Is. de San Benito (w of c Baja California), Roca Consag, Isla San Luis, Isla Partida and Isla Cardonosa Este (e of n, nc, c Baja California, Gulf of California)
- Non-breeding range
- coastal e Pacific waters n to c California and s to n Peru
- Migration
- Complete migrants
Behavior
The species breeds colonially on islands off the southern California coast of the United States and off the Baja Peninsula and Gulf of California of Mexico. Nesting sites are usually in rock crevices, occasionally in small burrows in soft earth. It also uses unused burrows from auklets. Colonies are attended nocturnally in order to avoid predatory birds such as gulls, hawks and owls. Like most petrels, its walking ability is limited to a short shuffle to the burrow. The female lays a single white egg per breeding season, if the egg is lost then it is replaced only rarely. Both parents share incubation duties, incubation lasting around 50 days. The chick is brooded for a few days after hatching until it is able to thermoregulate by itself, after which both parents forage to provide food. Chicks fledge 10 weeks after hatching.<p>The black storm petrel spends the rest of the year at sea, but occurring closer to shore than most other storm-petrels. Because of this, it sometimes can be seen from the mainland. It undertakes a migration away from the waters surrounding its breeding colonies and, unusually, has two wintering grounds, one in the California Current off Central California and another further south off the coast of Central America as far south as Colombia and Ecuador. It is thought to migrate in this fashion in order to avoid hurricanes in its breeding grounds.<p>It feeds on mainly planktonic crustaceans, with a preference of larvae of spiny lobster. It will also take small fish and offal. It feeds using several techniques, including plunge diving to 1 m below the water's surface from flight, feeding while swimming on the surface, and feeding while flying. At sea it usually forages singly.<p>The black storm petrel is a common species, numbering several million pairs, and is not considered threatened. It has suffered losses on some of the breeding islands, particularly from feral cats and rats. Island restoration projects have removed these predators from several of its nesting islands.<p>It was formerly defined in the genus Oceanodroma before that genus was synonymized with Hydrobates.
Conservation
Population trend: declining.
- Population trend
- declining
Photos
Distribution
Bird Calls
Other Birds
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