If you watch the birds at your feeding station you will see that some birds hop, hop, hop, and others prefer to walk around. Birds that hop take advantage of the pause between each jump to look around. Walking birds like the pigeons, doves, robins, and starlings, all move there head forward and back as they walk.
Like a toddler with a heavy head, the pigeon’s gate looks a little clumsy. However the bobbing head is really a way for the bird to fix his eyes on the surroundings. Although the head is moving relative to the body, the eyes are steady relative to the world, so the bird can focus on food or distant predators.
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