When you pick up the baby bird and try to give it back to the mama bird she will reject her baby.
This is the low-spoiler guide for "Recharge baby bird" puzzle in The Darkside Detective - A Fumble in the Dark. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.