How do puffins often nest, which sets them apart from certain other auks?

Answer

They dig burrows for their single chick.

Puffins exhibit colonial nesting behavior by digging burrows into cliffs or islands for their young, a practice that differs from some other members of the Alcidae family.

How do puffins often nest, which sets them apart from certain other auks?
birdanimalclassificationPuffin