A mockingbird is a grey bird with a long tail which is found in North America. Mockingbirds are able to copy the songs of other birds.
mockingbird in British English
(ˈmɒkɪŋˌbɜːd)
noun
1. Australian
any American songbird of the family Mimidae, having a long tail and grey plumage: noted for their ability to mimic the song of other birds
2.
a small scrub bird, Atrichornis rufescens, noted for its mimicry
mockingbird in American English
(ˈmɑkɪŋˌbɜrd)
US
noun
any of various New World passerine birds (family Mimidae); esp., a species (Mimus polyglottos) of the U.S. noted for its song and its ability to imitate the calls of many other birds