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Description:
The white ibis is a medium sized
wading bird that attains a height of 22 inches, with a wingspan of 38
inches. The sexes are
similar in appearance with entirely white body coloration, pink bill and legs,
black tipped outer primary feathers, and a distinctive bare face which
ranges in shades from red to pink. A major identifying characteristic
is its long decurved bill, which is somewhat longer in males than in
females. The eyes of adults are blue.
Habitat:
The white ibis is a nomadic species that
quickly colonizes wetlands when food is plentiful, and readily abandons an
area once resources become scarce. It utilizes both freshwater and estuarine
wetlands such as mangrove and cypress swamps, bottomland hardwood, and
marshes. In Florida, its preferred breeding habitat is in freshwater areas
where winter and early spring water levels are low or receding.
Similar Species:
The scarlet ibis (Eudocimus ruber), a South American species that has
been introduced in Florida, sometimes hybridizes with the white ibis.
Offspring of these matings are various shades of pink or red.
Range:
The white ibis occurs from Virginia south along
the Atlantic coast to the Gulf of Mexico. It is found on both coasts of
Mexico, and ranges as far south as Columbia and Brazil.
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White ibises in a mosquito impoundment. Photo courtesy of K. Hill, Smithsonian Marine Station.
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White ibis feeding. Photo courtesy
of J. Crawford, Plam City, FL.
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White ibis chicks are susceptible to slow
growth rates and increased mortality due to salt stress when
they are fed on fiddler
crabs (Uca spp.). For this reason, parental birds do not offer
fiddler crabs to nestlings when foraging
conditions are good. Rather, chicks are fed primarily on freshwater fish, crayfish and
insects. |
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