What are born with fur that grows thicker for warmth in winter?
bullfrogs insects birds monotremes turtles mammals pigeons Echinoids
A B C D E F G H
Mammals are animals that are born with fur or hair.
Mammals are born with fur that grows thicker for warmth in winter.
What are born with fur that grows thicker for warmth in winter? (A) bullfrogs (B) insects (C) birds (D) monotremes (E) turtles (F) mammals (G) pigeons (H) Echinoids