I found one, got so excited to have it that i immediately put it in a TC and forgot to turn it in to Chimalma. So on my way to go get it back out to show her, i found another one floating around. I'm thinking you're not supposed to just keep finding them until you turn it in, so guessing this is a...bug. :P I'll just keep the second one in my inventory until i hear from a staff person what i should do with it...

Edit: As instructed, i have deleted the extra.

I think with the birds, there was code to not "drop" another one if there was one currently in your inventory.

I'm not sure if (for the bug catching) if this is a bug or a feature... so. Either way it's probably good to get official notice about it (and if it's a bug, patch it up).