Galapagos flightless cormorant

The Galapagos Cormorant is the only one of its kind to have completely lost the ability to fly – a combination of the lack of predators and the abundant food supply found in the Galapagos Islands. Given the rich supply of fish, the cormorants of the Galapagos specialized in developing stronger legs and feet, and thus lessened their reliance on their wings, so they were able to dive down deeper, to occupy a niche which other birds could not reach. Since they no longer needed to travel vast distances to find food, they gradually lost the use of their wings.