There are roseate spoonbills, snowy egrets, and wood storks. Summer visitors should watch for roseate spoonbills, magnificent frigatebirds and least terns. These are laughing gulls as well as royal, roseate and least terns. Rockabill has the largest numbers of breeding roseate terns in Europe. From a distance, untrained eyes can also confuse it with the roseate spoonbill. The roseate spoonbill is long, with a wingspan and a body mass of . Anglesey is home to several species of tern, including the roseate tern. English naturalist George Montagu described the roseate tern in 1813. Storm petrels (largest breeding numbers in the world), roseate tern, chough, and corncrake. The Canadian Wildlife Service lists the roseate tern as Threatened. Hybrids recorded include common tern with roseate, Sandwich with lesser-crested, and black with white-winged. The non-breeding plumage of roseate is pale above and white, sometimes pink-tinged, below. The roseate tern ("Sterna dougallii") is a tern in the family Laridae.