Little Blue Heron
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The Little Blue Heron (Egretta caerulea) is a small heron. It breeds from the Gulf states of the USA, through Central America and the Caribbean south to Peru and Uruguay. It is a resident breeder in most of its range, but some northern breeders migrate to the southeastern USA or beyond in winter. There is post-breeding dispersal to well north of the nesting range, as far as the Canada–United States border.
Description[edit source | edit]
This species is about 60 centimetres (24 in) long, with a 102-centimetre (40 in) wingspan, and weighs 325 grams (11.5 oz). It is a medium-large, long-legged heron with a long pointed blue or greyish bill with a black tip. Breeding adult birds have blue-grey plumage except for the head and neck, which are purplish and have long blue filamentous plumes. The legs and feet are dark blue. Sexes are similar back. Non-breeding adults have dark blue head and neck plumage and paler legs. Young birds are all white except for dark wing tips and have dull greenish legs. They gradually acquire blue plumage as they mature.
Ecology[edit source | edit]
The Little Blue Heron's breeding habitat is sub-tropical swamps. It nests in colonies, often with other herons, usually on platforms of sticks in trees or shrubs. 3–7 light blue eggs are laid. The Little Blue Heron stalks its prey methodically in shallow water, often running as it does so. It eats fish, frogs, crustaceans, small rodents and insects.
White Little Blue Herons often mingle with Snowy Egrets. The Snowy Egret tolerates their presence more than Little Blue Herons in adult plumage. These young birds actually catch more fish when in the presence of the Snowy Egret and also gain a measure of protection from predators when they mix into flocks of white herons. It is plausible that because of these advantages, they remain white for their first year.
References[edit source | edit]
- BirdLife International (20012). "Egretta caerulea". IUCN Red List of Threatened Species. Version 2012.2. International Union for Conservation of Nature. Retrieved May 24, 2013.
- Steven L. Hilty (2003). Birds of Venezuela. Christopher Helm. ISBN ISBN 0-7136-6418-5.
- Herbert W. Kale (1990). Florida's Birds. A Handbook and Reference. Sarasota, Florida: Pineapple Press. ISBN 0-910923-68-X.
- Field Guide to the Birds of North America. National Geographic Society. 2002. ISBN 0-7922-6877-6.
- F. Gary Stiles & Alexander F. Skutch (1990). A guide to the birds of Costa Rica. Cornell University Press. ISBN 0-8014-9600-4.