The highly intelligent parrot has a specific call, that—like human laughter—puts other parrots that hear it in a good mood. This makes the kea the first known non-mammal to show contagious emotion, joining the ranks of humans, rats, and chimpanzees.
Scientists already knew that kea—native to New Zealand's mountainous South Island—make a non-threatening warbling sound while playing with other kea. But since the birds also warble alone, the noise could simply be an expression of pleasure. Go here to see a video
NO LAUGHING MATTER
Kea play a lot—by themselves, with others, on the ground, or in the air.
While aloft, kea perform aerial acrobatics and chase each other. Playing with objects is usually solitary, with a bird manipulating an object with its beak and/or feet, but it can also involve birds tossing an object between each other. (Also see "Walruses Found Using Birds as Toys for First Time.")
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