It is important that birds keep their feathers clean dry and flexible; it helps them to stay healthy. The term used for cleaning feathers is called preening. Most of the birds will clean themselves several times a day.
There are many birds that have special oil that comes from a gland near the base of their tails. They will use that oil to help clean their feathers, and some birds will use their oil to weatherproof their feathers.
The bird below is a American Robin cleaning its feathers.
Robins will join up with other robins in the fall and winter months. They will hunt together for berries, and food. They eat a lot of fruit in the winter months. The flock will roost together in trees at night
In the fall and winter months the robins will gather in large flocks to roost in trees; also to find and eat berries. If the robins eat lots of honeysuckle berries, they can become intoxicated.
In the mornings the robins will hunt for earthworms. They find earthworms by sight; they will run or hop along and stop on lawns, looking for the worms. The robins can get poison if pesticides are used on lawns. They also like insects and some snails. Later in the day they will look for more fruit and berries to eat.