Spring don't start until there are leaves

Seems like yesterday the trees in my front yard were bare with no leaves now today nearly every inch on their limbs are covered with leaves. It's as if a button was pushed and thousands of leaves simultaneously popped out. All the birds are flying around picking and choosing where their nest will be built. There was family after family of insects coming from every direction as the sign of leaves means they can come out of their underground spots to make a new home. I watched a woodpecker easily pecking devouring a buffet of insects as they trailed up the tree. Spring may have officially started weeks ago but for the animals and insects it starts when they see new leaves they can hide in.