are only 44 gannet colonies occurring in the world and
St Kilda is by far the largest. One fifth of the world's
population of northern gannets nests on Boreray, Stac
an Armin and Stac Lee in huge colonies. That's a massive
60, 428 breeding pairs (so double that for the actual
number of birds!).
Why do they choose to live so close together? We think
one reason is because there is a good supply of food
nearby. The seas around St Kilda have a lot of fish
Gannets dive for fish and squid to eat and can hit the
water at nearly 100 kilometers per hour. So they have
extra thick skulls, which act like crash helmets.