He's a Double Yellow Headed Amazon (if I'm recalling what the parrot_lovers slang DYH stands for correctly), and the videos I've seen of them imply that they prefer to imitate human yelling over human talking, so it could also be the attempts at yelling what he's singing that make it off-key. But it's still so cute. ^_^ Birds can have limited comprehension of what they're saying, much like monkeys and apes and chimps who learn sign language do, but there's no (undisputed) evidence of their understanding grammar or language itself.
Oh, that could definitely be the top reason overall, but sat/stepped on is the top among individual birds belonging to my coworkers or friends or relatives.
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I hadn't seen the original video until now, it's really cute.
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It would be both cool and scary if cats and dogs could do what birds do, even if most of it is just imitation.
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