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The Eurasian oystercatcher (Haematopus ostralegus), also known as the common pied oystercatcher, or (in Europe) just oystercatcher, is a wader in the oystercatcher bird family Haematopodidae.

This species is found worldwide except for the polar regions. 
The bird is migratory.

Charadriiformes, Charadriidae, Charadrius: Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate; from Ancient Greek kharadrios a bird found in ravines and river valleys (kharadra, "ravine").

The family Haematopodidae derives its name from the Latinized scientific genus Haematopus, which is composed of Ancient Greek roots, specifically describing the bird's distinctive red legs:
 - Haemato- / Haima (αἷμα): Derived from Ancient Greek, meaning "blood".
 - pus / Pous (πούς): Derived from Ancient Greek, meaning "foot".

The species name ostralegus: translates to "oyster-gatherer" or "shell-gatherer". 
- ostrea: Meaning "oyster".
- legere: Meaning "to gather," "to collect," or "to pick".

Haematopodidae, Haematopus - oystercatchers

Haematopus is a single bird genus of the oystercatchers' family Haematopodidae.

Charadriiformes, Charadriidae, Charadrius: Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate; from Ancient Greek kharadrios a bird found in ravines and river valleys (kharadra, "ravine").

The family Haematopodidae derives its name from the Latinized scientific genus Haematopus, which is composed of Ancient Greek roots, specifically describing the bird's distinctive red legs:
 - Haemato- / Haima (αἷμα): Derived from Ancient Greek, meaning "blood".
 - pus / Pous (πούς): Derived from Ancient Greek, meaning "foot".