Bird feet that have three toes pointing forward and one pointing back are called anisodactyl feet.
Toes are numbered from inside to outside.
Conversation
Look at your feet. See your big toe? That's digit 1. If you were an anisodactyl bird, your big toe would hang off your heel, straight back.
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So, all shorebirds, perching birds, hawks, eagles, wading birds...they all have anisodactyl feet.
There are other toe arrangements!
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Let's look at parrots, woodpeckers, roadrunners. They have two toes pointing forward, and two toes pointing back.
That's a zygodactyl foot.
GIF
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Now owls...owls are a funky bird. Check out this owl's foot. There's a lot of flexibility in how owls move their toes.
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Inner toe of owls can be positioned so that foot looks both zygodactyl (3-1) or anisodactyl (2-2)
There are Cretaceous zygodactyl tracks!
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Meet Shandongornipes, a zygodactyl Early Cretaceous bird track from China!
scienceblogs.com/grrlscientist/
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Replying to
I think that's just the animation: I don't know if BfBs hop!
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