The ferrets then had no food. We observed live worms in grade 1 to study more about animal movement. We observed how the worms moved on different surfaces as well. When our lesson was over, the worms became an important addition to Mrs. Craib's garden, aerating and fertilizing the soil. Fish don't close their eyes when they're asleep because they don't have eyelids.
Opossums are the only North American mammal with a pouch.
A hummingbird may get nectar from 2000 flowers in one day. A hippo's nose, eyes, and ears are on top of its head. That way it can still breathe, see, and hear when most of its head is hidden under water. The smallest tree in the world is the dwarf willow.