Scripps’s Murrelet
Scripps's Murrelet
Synthliboramphus scrippsi
At a Glance
Most members of the auk family favor cold northern waters, but this one is found mostly off Baja and southern California. It nests on offshore islands, and is almost never seen from the mainland. Generally uncommon, it occurs at sea in pairs or family groups, not in flocks. Young Scripps's Murrelets get an early start on their sea-going life, leaving their nest only one or two days after hatching, often having to jump more than 200 feet down from cliffs into the surf before swimming away with their parents. Formerly known as Xantus's Murrelet.
All bird guide text and rangemaps adapted from by Kenn Kaufman© 1996, used by permission of Houghton Mifflin Harcourt Publishing Company. All rights reserved.
IUCN Status
Vulnerable
Habitat
Coasts and Shorelines, Open Ocean
Population
15.000
Range & Identification
Migration & Range Maps
. A few are present off southern California all year, but common mainly March through June. Numbers drop sharply in mid-summer, with many of these birds evidently going north (at least to central California). Whereabouts in winter poorly known. Probably does much of migration by swimming, not flying.
Description
9 1/2-10 1/2" (24-27 cm). A small seabird, sharply bicolored, blackish above and white below. Usually seen in pairs. Compare to Craveri's Murrelet and Guadalupe Murrelet.
Size
About the size of a Robin
Tail Shape
Short
Habitat
Ocean, islands. Generally in relatively warm waters and well offshore. May be close to nesting islands but almost never close to mainland; may go far out beyond continental shelf. Nests on islands with steep cliffs, rocky slopes, dense cover of bushes.
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Behavior
Eggs
2, rarely 1. Large for size of bird, pale blue to dull green, with few or many brown spots, sometimes solid brown. Incubation is by both sexes, 27-44 days.
Young
Parents do not feed young in nest. 1-2 nights after hatching, downy young are led from nest by parents, who then fly away; young make way to water, often jumping from cliffs more than 200’ down to surf. Parents and young reunite in water and swim away from island. Young remain with parents and are fed by them for lengthy period. 1 brood per year, but may lay a 2nd clutch if first clutch is lost.
Feeding Behavior
Forages by diving and swimming underwater, propelled by wings. Pairs or family groups may forage together.
Diet
Poorly known. Probably eats mostly small crustaceans and other marine invertebrates. Thought not to be much of a fish eater.
Nesting
Breeds on islands in small colonies. Birds typically have same mate and same nest site each year. Nest site is in rock crevice, under dense bush, under debris, or in abandoned burrow of other species; no nest built
Climate Vulnerability
Conservation Status
Total population probably low. Vulnerable to predators, even small ones, on nesting islands; in one study, almost half of all eggs were destroyed by deer mice. Accidental introduction of rats could devastate colonies.