One of the sweetest bird behavior to witness is when a young bird is being fed by a parent. We've had many young birds show up in our yard this summer, and I've been lucky enough to see quite a few of them begging and being fed.
But when the bird dad is as flashy as a male Northern Cardinal, the scene is one that just sticks in your mind. Here's a few images of a cardinal dad taking care of one of his young. Then check out the short video of the young bird being fed by dad and continuing to ask for more with a wing quiver and persistent begging call.