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cownose ray
:''For other species of cownose rays, see ''Rhinoptera''.
The cownose ray (''Rhinoptera bonasus'') is a species of eagle ray found throughout a large part of the western Atlantic and Caribbean, from New England, USA to southern Brazil (East Atlantic populations are now generally considered a separate species, ''R. marginata''). Cownose rays grow rapidly, and male rays often reach about in width and weigh . Females typically reach in width and weigh .
==Gestation==
The embryo grows within its mother with its wings folded over its body. Initially it is nourished by an egg yolk, although the uterine secretions of the mother nourish it later in its development. The length of gestation is disputed. At full term, the offspring are born live, exiting tail first.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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