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An adult male killer whale with its characteristic tall dorsal fin swims in the waters near Tysfjord
Male African lion of the Transvaal subspecies
Wandering Albatrosses are colonial but have large widely spaced territories. Here a pair performs th
A male Lestes dryas in the "spread-winged" posture that gives the family its common name
Comparison of Female and Male Pelves
The pseudoautosomal regions of the X and Y chromosomes