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By J. Bryan Nelson

The pelecaniformes are a wide and significant workforce of seabirds, containing many mind-blowing species. This booklet addresses the breeding biology of the six pelecaniform households, which include the closely-related center teams (pelicans, cormorants/shags, darters, gannets/boobies) and their extra far-off family, the frigate birds and tropic birds. Many basic questions should be addressed during the pelecaniformes: Why do they breed in colonies? What are the hyperlinks among their feeding equipment and their replica? What half does territorial and pairing habit play of their life-cycles? those and rankings of similar concerns, together with these with regards to guy, are woven right here right into a richly interpretative text.The author's method of the topic is threefold. First, the pelecaniformes are put in the framework of 4 discrete disciplines, with chapters on evolutionary relationships, comparative habit, ecology, and the birds' dating with people. Secondly, all of the six households is mentioned, elucidating the variety of taxonomy, habit, and ecology inside of every one. eventually, we growth to precise point, utilizing an identical constitution as for the family members bills. during this approach, all of the 60-odd species could be understood not only as discrete devices, yet as a part of their kin and order. The booklet is exclusive in its assurance of the full order and in its blend of evidence and interpretation. Pelicans, Cormorants, and their relations will let readers not just to spot the various excellent species which make up this huge and demanding crew of seabirds, but additionally to appreciate their breeding biology.

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Extra resources for Pelicans, Cormorants, and Their Relatives: The Pelecaniformes (Bird Families of the World)

Example text

In pelecaniforms (except tropicbirds) male advertising is perhaps more strongly developed than in any other seabirds except penguins. 7). On the other hand, the gannets have inconspicuous advertising but highly developed pair-bonding display (see figures at end of Chapter 5). No pelecaniform is known to maintain contact between partners away from the breeding colony and, as mentioned, pair-bonds are generally shortlived. Yet permanent bonding has advantages such as effective cooperation in breeding.

However, in the two species which most often breed in close proximity (great and lesser frigatebirds) there are considerable differences in size, plumage and behaviour. Fossil frigatebirds Until recently the only known fossils were from the Pleistocene, and were of extant species. Then Olson (1977) identified a fossil from the Eocene (Wyoming) and proposed the name Limnofregata azygosternum (see above). 3) but its bones were heavier. Olson suggests it was better suited for flapping flight and better able to alight and take-off from land and water.

Crèching occurs only in species which will feed their young away from the nest site (some, such as Abbott’s booby, will not do so). Even after fledging, pelicans will feed young at the edge of a crèche. Ontogeny of behaviours Play, prey-handling movements, handling nestmaterial, nest-building, body care and, in boobies, cormorants, anhingids and pelicans, fairly complete versions of ritualized territorial and sexual display, develop in a predictable sequence (Sp Acc) whilst the young are still partly downy.

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