Peacocks have a sharp spur on the back of each leg, just above the foot. These spurs are used for fighting, especially between males competing for territory or mates.

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Peafowl

They're strongly territorial during breeding season, which may explain why the family swims in such a tight formation, with the parents guarding the goslings on either side.

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Canada Geese

Dingoes can rotate their heads almost 180° and have unusually flexible necks, which helps them track sounds and movement when hunting. They also communicate extensively through howling rather than barking.