Lark species, including hoopoes, crested larks and ashy-crowned sparrow-larks are commonly observed in the desert during the summer.[12] More commonly occurring species during the autumn and spring are swallows, swifts, house martins, warblers, redstarts, shrikes, wheatears, wagtails, harriers and falcons (including kestrels).[12] Four of the primary types of birds which can be observed in deserts during the winter are various types of waders and gulls, coots, and little grebes.[12] Rare birds such as the avocet and red-billed tropicbird breed on the peninsula.[7]