Today I didn't feed Mango because I was in bed and still very tired so Mango decided to eat the pellets that were left in his bowl and he ate them all and when I got up I gave him more and its lucky he is eating them because there is no seed left.

OK, now he knows that they're food. They might not be his favorite food, but he might start liking them better after he's had more time to get used to them.

He always did know they were food remember he was eating them from the Cockatiels cage.