How should I know? They don't mind eating the grubs but they want something else too!

[Luckily, it didn't take them too long before they were convinced to help them out. After a couple more minutes, that's when he looked back at the older man and then back at the birds.]

Okay, they'll agreed but I really hope you appreciate how much effort I'll be helping you get the grubs out. [Pause] Because I don't know what foods birds like.