The Grallatores ( 23 species ) were nearly equal to the Natatores ( 22 species ).
按生活型分,涉禽23种, 游禽 22种,种类几乎相等.
"duck: any of various wild or domesticated swimming birds of the family anatidae, characteristically having a broad, flat bill, short legs, and webbed feet."
“鸭:鸭科的一种野生或家养游禽,其特点是有宽大扁平的喙,短腿和带蹼的足.”
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