What unique physical trait assists Bullfinch parents in provisioning their chicks?

Answer

They have specialized food sacs located in the floor of their mouths.

Bullfinches have developed specialized food sacs in the floor of their mouths, an adaptation that enables parents to carry a significantly larger volume of food back to the nest during a single foraging trip.

What unique physical trait assists Bullfinch parents in provisioning their chicks?

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Things you need to know about the BULLFINCH! - YouTube

speciesbirdwildlifefeatherBullfinch