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The snow goose has two color plumage morphs, white (snow) or gray/blue (blue), thus the common description as "snows" and "blues". White-morph birds are white except for black wing tips, but blue-morph geese have bluish-gray plumage replacing the white except on the head, neck and tail tip.
Barnacle goose: Branta leucopsis (Bechstein, 1803) 15 Cackling goose: Branta hutchinsii (Richardson, 1832) 16 Bar-headed goose: Anser indicus (Latham, 1790) 17 Emperor goose: Anser canagicus (Sevastianov, 1802) 18 Ross's goose: Anser rossii Cassin, 1861: 19 Snow goose: Anser caerulescens (Linnaeus, 1758) 20 Greylag goose: Anser anser (Linnaeus ...
Two cladograms proposed for Panthera. The upper cladogram is based on two studies published in 2006 and 2009, [11] [21] the lower one is based on studies published in 2010 and 2011. [12] [22] Based on the phylogenetic analysis of the DNA sequence sampled across the living Felidae, the snow leopard forms a sister group with the tiger (P. tigris).
A nonoptimal cladogram will be selected if the program settles on a local minimum rather than the desired global minimum. [16] To help solve this problem, many cladogram algorithms use a simulated annealing approach to increase the likelihood that the selected cladogram is the optimal one. [17]
The results of phylogenetic/cladistic analyses are tree-shaped diagrams called cladograms; they, and all their branches, are phylogenetic hypotheses. [ 12 ] Three methods of defining clades are featured in phylogenetic nomenclature : node-, stem-, and apomorphy-based (see Phylogenetic nomenclature§Phylogenetic definitions of clade names for ...
A simple cladogram showing the evolutionary relationships between four species: A, B, C, and D. Here, Species A is the outgroup, and Species B, C, and D form the ingroup. In cladistics or phylogenetics, an outgroup [1] is a more distantly related group of organisms that serves as a reference group when determining the evolutionary relationships of the ingroup, the set of organisms under study ...
Anseriformes is an order of birds also known as waterfowl that comprises about 180 living species of birds in three families: Anhimidae (three species of screamers), Anseranatidae (the magpie goose), and Anatidae, the largest family, which includes over 170 species of waterfowl, among them the ducks, geese, and swans. Most modern species in the ...
The snow goose (Anser caerulescens) is a North American species of goose. Snow Goose or The Snow Goose may also refer to: The Snow Goose: A Story of Dunkirk, a novella by Paul Gallico; The Snow Goose, a 1971 film based on the novella by Paul Gallico; The Snow Goose, an album by the band Camel