Pelecanus
erythrorhynchos
(American White Pelican)
Physical
Description:
Size: 54-74" (137-138
cm). This is a large white bird with black primary and secondary flight feathers.
Note the large, yellow, pouched bill. It has a wingspan of 8 to 9.5 feet. In
flight, it alternately soars and flaps. Flies with neck bent and head close
to body.
Similar Species- The Trumpeter Swan has no black on its wings. The Whooping Crane flies with its neck straight.
Song:
Generally silent.
Distribution:
Breeds in Canadian Prairie
Provinces and parts of northwestern and midwestern U.S., south to coastal Texas.
Winters along Gulf and Pacific coasts south to Guatemala. In Idaho, breeds at
Minidoka National Wildlife Refuge, Blackfoot Reservoir, and on Snake River near
Glenn's Ferry.
Diet:
Feeds mainly on fishes of little commercial
value (e.g., carp, perch, catfish, suckers, stickleback). Eats some salamanders
and crayfishes.
Ecology:
Gregarious. Nests on ground, in rimmed scrape. In Idaho, several nesting colonies have been abandoned due to human distrubance. Foxes and coyotes are nest predators. Estimates from 1993 survey indicate 150-175 nexts are located at Minidoka NWR and 80-100 nests are located at Blackfoot Reservoir.
Reproduction:
Both adults incubate 2 eggs (usually); rarely
does more than 1 young fledge (in an Idaho study, 5
nests yielded an average of 1.8 young/nest). Young are tended by both adults,
leave nest in about 21-28 days, and first fly at 7-10 wk. In Manitoba study,
34-38 days elapsed between time flocks first flew over colony
sites and time eggs hatched.
Conservation:
Element Code: | ABNFC01010 |
Status: | Protected nongame species |
Global Rank: | G3 |
State Rank: | S1 |
National Rank: | N3B,N3N |
Important
State References:
Trost, C.H. and A. Gerstell. 1994. Status
and distribution of colonial nesting waterbirds in southern Idaho, 1993. Dept.
Biol. Sciences, Idaho St. Univ., Pocatello. 101pp.