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The population in the years following the drought in 1977 had "measurably larger" beaks than had the previous birds. In 1981, the Grants came across a bird they had never seen before. It was heavier than the other ground finches by more than five grams. [11] [12] [13] They called this bird Big Bird.
Swimming birds have a wide sternum, walking birds have a long sternum, and flying birds have a sternum that is nearly equal in width and height. [19] The chest consists of the furcula (wishbone) and coracoid (collar bone) which, together with the scapula , form the pectoral girdle ; the side of the chest is formed by the ribs, which meet at the ...
The Sibley–Monroe checklist is a list of bird species based on a study conducted by Charles Sibley and Burt Monroe. It drew on extensive DNA–DNA hybridization studies to reassess the relationships between modern birds. It was considered a landmark in ornithology on its release. [1]
The common loon or great northern diver (Gavia immer) is a large member of the loon, or diver, family of birds. Breeding adults have a plumage that includes a broad black head and neck with a greenish, purplish, or bluish sheen, blackish or blackish-grey upperparts, and pure white underparts except some black on the undertail coverts and vent.
The American white ibis (Eudocimus albus) is a species of bird in the ibis family, Threskiornithidae.It is found from the southern half of the US East Coast (from southern New Jersey, Virginia, the Carolinas and Georgia), along the Gulf Coast states (Florida, Alabama, Mississippi, Louisiana and Texas) and south through most of the Caribbean coastal regions of Central America. [2]
However, the Pleistocene coot Fulica shufeldti (formerly F. minor), famously known as part of the Fossil Lake fauna, quite possibly was a paleosubspecies of the American coot (as Fulica americana shufeldti) as they only differed marginally in size and proportions from living birds. [14]
The rock dove, rock pigeon, or common pigeon (/ ˈ p ɪ dʒ. ə n / also / ˈ p ɪ dʒ. ɪ n /; Columba livia) is a member of the bird family Columbidae (doves and pigeons). [3]: 624 In common usage, it is often simply referred to as the "pigeon", although this is the wild form of the bird; the pigeons most familiar to people are the domesticated form of the wild rock dove.
Young birds from previous years may stay behind to help raise the group's young, and studies have found reproductive success for the group goes up with group size, but individual success goes down. Birds may be forced to remain in groups due to a lack of habitat to which to disperse. [45] Great spotted woodpecker feeding its chick, Russia
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