What kind of bird is the Liverbird?

I guess you are referring to a species of Cuckoo called the Liffey Bird. Note, however, that the name "Leaver Bird" is not a widely used common name.

The family Cuculidae is a family of common birds that includes many species of cuckoos. Cuckoos are parasitic birds that place their eggs in the nests of other birds and use them to incubate and raise their offspring. The name Liffey Bird may refer to a specific species of cuckoo, but it is not a generally accepted scientific or common name. If you can provide more information I can give a more specific answer.

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