Can someone please explain the "two hookers" puzzle?

two hookers	=	horns?
two snookers	=
two lookers	=	eyes
four dilly-danders	=
four stiff-standers	=	legs?
two flip-flops	=	ears?????
one fling-by	=	tail?

equals a cow.

Also, on the mammals question, how about the bat? Off the face of the earth, but in the air.