The nearby Puffin Island is another seabird colony. The Atlantic puffin is a species of seabird in the order Charadriiformes. Marine birds include tufted and horned puffin, common and thick-billed murre, and marbled murrelets. While at sea, the Atlantic puffin has its annual moult. The male Atlantic puffin builds the nest and exhibits strong nest-site fidelity. The bird is a puffin from Maine, USA. The prey species of the Atlantic puffin include the sandeel, herring and capelin. Rises in ocean temperature have increased the reproductive rate of the horned puffin. When herring numbers dwindled, so did puffin numbers. Both sexes of the horned puffin help to construct their nest. The horned puffin is relatively common across its range. The castle has stunning views over the Snowdonia mountains, the Menai Strait and Puffin Island. In 2018, BirdLife International reported that the Atlantic puffin was threatened with extinction. Puffin Island is made of carboniferous limestone. A novelization was written by Kiki Thorpe and was published by Puffin Books.