Name game

A first-grade class is having a game of Name That Animal.
The teacher held up a picture of a cat.
"What animal is this?" she asked.
"A cat!" said Eddie.
"Good job! Now, what is this animal?"
"A dog!" said Eddie.
"Good! Now what animal is this?" she asked, holding up a picture of a
Deer. The class fell silent. After a couple of minutes, the teacher said,
"It's what your mom calls your dad."
"A horny bastard," called out Eddie.