What kind of chicks are you thinking of? Newly hatched chicken or quail chicks would be edible by a 4ft BP. If anything I'd think they'd be small. I don't know how they compare in regard to nutrition, but as far as size goes they're not too big.
I was thinking of my own. Some of the baby chickens I bred last year were massive. And usually baby chicks at local feed store are usually rather large as well even for an adult bp.