Immense numbers of birds nest on these islands during the seabird breeding season, roughly from 1 April through 1 September.

The Witless Bay reserve contains North America´s largest Atlantic puffin colony.

It is estimated that more than 260,000 pairs of Atlantic puffins nest there during the late spring and summer.

Thousands of black-legged kittiwakes and common murres arrive for the nesting season.

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