Hummingbird

The hummingbird was a small bird on Earth noted for its ability to hover because of its wing beat. Sometimes it could beat its wings as fast as 80 times a second; if a human did that, they would burst into flames. (PROSE: The Left-Handed Hummingbird)

Jack Harkness said that the firebird was even smaller than the hummingbird. (TV: Immortal Sins)