During the spring, cows would have their calves. The cows would produce milk that would be turned into butter. Springtime is also when butterflies start to come out. These flying bugs were named butterflies because they would fly around while milk was churned to butter. I would get pretty tired of the taste of socks.
Butterflies have many enemies.
Insects may eat their eggs, birds like to eat the caterpillars and lots of things like to eat the adults. A butterfly may land on a flower only to find itself in the clutches of a hungry crab spider or being attacked by a praying mantis or damsel bug. Some butterflies, like the monarch, taste awful and advertise this fact by being bright orange. They taste awful because as caterpillars they feed on milkweeds, which contain a special chemical. Well, since butterflies feed on nectar from flowers, compare how hard it would be for the butterfly to walk from one plant to another versus flying.