Imagine you are walking in a forest during the daytime. You can hear many birds singing happy songs in the trees. A big moose is eating grass quietly nearby, and little squirrels are busy looking for cones to eat or store.
When the sun starts to go down and it begins to get dark, some animals that like nighttime come out. A lynx, which is a wild cat, sneaks around to find food. At the same time, frogs make loud croaking sounds, which you can hear all around the forest.
This shows us how different animals do different things depending on whether it’s day or night.