Birds. They probably evolved from flying seabirds.
The excrement of seabirds used for fertilizer is guano.
Seabirds live at sea, although they do visit coastlines to breed.
At 80N 40W, you would find the Svalbard archipelago, which is a group of islands located in the Arctic Ocean. The main island in this group is called Spitsbergen. These islands are known for their remote and rugged beauty, as well as being home to diverse wildlife such as polar bears and seabirds.
Seabirds find their food source -- and warmth -- in the ocean waters where they make their homes.
There are many types of seabirds: Albatross, Auk, Booby, Frigatebird, Fulmar, Gannet, Murre, and Penguin.
The are seabirds that eat clam and fish.
Seabirds in that geography include Skua, Albatross, Tern, Penguin and others.
Adults have few predators, but many seabirds eat the chicks of other seabirds and fulmar chicks are no exception.
There were several. Hitchcock used crows, seagulls and other seabirds.
They eat mackeral and krill
fish