These islands are claimed by some biologists to be the largest bird colony in the North Pacific. According to bird counts there are an estimated 7 million birds nesting on Matykil Island, the largest in the group. Birds include Common and Brunnichs Guillemot, Crested, Parakeet and Least Auklets, Tufted and Horned Puffins and Northern Fulmars. The most abundant of these is the Least Auklet. Zodiac cruise around the coast as no landings are permitted.