Has a rare species of nine-legged bird been discovered? No, it's just a parent keeping her chicks warm | Daily Mail Online
Bird legs and feet | Sussex Wildlife Trust
Walking like a dinosaur (or bird): This robot's legs are designed for maximum efficiency | CBC Radio
Bird feet and legs - Wikipedia
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Birds Feet (Anatomy, Types & Fun Facts) - Nature Roamer
The legs: a key to bird evolutionary success | Journal of Ornithology