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The Oystercatchers are a group of waders; they form the family Haematopodidae, which has a single genus, Haematopus. They are large obvious and noisy plover-like birds, with strong bills used for smashing or prising open molluscs.
In some species, the bill shape varies according to the diet. Those birds with blade-like bill tips prise open or smash mollusc shells, and those with pointed bill tips tend to probe for worms.
They are found on coasts worldwide apart from the polar regions. They are all-black, black and white or brown and white in appearance.
Their eggs are laid in a shallow scrape on shingle. Oystercatcher eggs are grey and speckled, providing camouflage against the grey rock background. They are pointed at one end. Contrary to popular belief, the purpose of this is not to provide space for the chick's long beaks (their long beaks develop after hatching). The pointed shape is thought to prevent the eggs from rolling down a steep slope.
- ORDER CHARADRIIFORMES
- Suborder Charadrii: waders
- Family Thinocoridae: seedsnipe
- Family Pedionomidae: Plains Wanderer
- Family Scolopacidae: snipe, sandpipers, phalaropes, and allies
- Family Rostratulidae: painted snipe
- Family Jacanidae: jacanas
- Family Chionididae: sheathbills
- Family Burhinidae: thick-knees
- Family Haematopodidae
- Magellanic Oystercatcher, H. leucopodus
- Blackish Oystercatcher, H. ater
- American Black Oystercatcher, Haematopus bachmani
- American Oystercatcher, H. palliatus
- Canarian Black Oystercatcher, H. meadewaldoi
- African Black Oystercatcher, H. moquini
- Eurasian Oystercatcher, H. ostralegus
- Australian Pies Oystercatcher, H. longirostris
- Chatham Islands Oystercatcher, H. chathamensis
- Variable Oystercatcher, H. unicolor
- Sooty Oystercatcher, H. fuliginosus
 American Pied Oystercatcher ( Haematopus palliatus) Image from 'Birds of America" J.J. Audubon -
- Suborder Lari: gulls and allies; 4 families
- Suborder Alcae: auks; 1 family
Common Pied Oystercatcher American Black Oystercatcher (Haematopus bachmani)
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