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Like babies, cockatiels love to play the “drop and retrieve” game.
As in, they drop it (whatever “it” is) and you retrieve it.
Cockatiels also love anything that crinkles or crunches. If it is securely encased in crinkly, crunchy packaging, even better.
I first discovered Pearl’s fondness for fortune cookies when I came home with Chinese takeout and accidentally left a fortune cookie (in its crinkly wrapper) out on the counter.
It didn’t take long.