Puerto Rican Emerald

Medium-sized plover with a long hefty bill. Breeding adults have a dark mask and orangish chest, neck, and forehead; females duller than males. Non-breeding birds and immatures are sandy brown above and white below, with a white throat and “eyebrows.” Often confused with Lesser Sand-Plover, and best distinguished when both present; look for larger size, heavier and longer bill, paler legs, and larger-headed appearance. Additionally, unlike some Lesser Sand-Plovers, Greater never has a black boundary around the throat. Breeds in high-elevation areas, where it favors arid, open habitats, sometimes near water. Winters on coastal mudflats and estuaries.

Small bird with thin bill (longer than on most other gerygones), found only in dense mangroves along the northwestern Australian coast. Grayish brown above, off-white below, with pale eye. Juvenile has brownish eye. Similar Mangrove Gerygone has red eye, smaller bill, and white patches in tail; Large-billed Gerygone has dark eye and heavier bill. Unlikely to be seen outside mangrove habitat.

Bull-necked, big-headed crossbill with a deep and heavy bill, otherwise identical to Red Crossbill. Males are red; females and juveniles greenish. Deeper call notes "chup, chup" subtly different from Red Crossbill. Occurs mainly in mature and tall coniferous forests, especially pine forests, although may be found in spruce and conifer plantations during periodic irruptions following pine-cone crop failure.