Wagtail(n.) Any one of many species of Old World singing birds belonging to Motacilla and several allied genera of the family Motacillidae. They have the habit of constantly jerking their long tails up and down, whence the name.
Thesaurus Entries
Antaeus, Asp, Asroc, Atlas-Agena, Atlas-Centaur, Briareus, Brobdingnagian, Bullpup, Cajun, Charles Atlas, Corporal, Corvus, Crossbow, Cyclops, Dart, Deacon, Delta, Diamant, Dove, Falcon, Firebee, Gargantua, Genie, Goliath, Hawk, Hercules, Holy Moses, Hound Dog, Jupiter, Lacrosse, Lark, Loki, Loon, Mace, Matador, Navaho, Nike, Nike Ajax, Orion, Pershing, Petrel, Polaris, Polyphemus, Poseidon, Quail, Ram, Rascal, Redeye, Redstone, Regulus I, SLAM, Samson, Saturn, Scout, Sentinel, Sergeant, Shillelagh, Sidewinder, Skybolt, Snark, Spaerobee, Sparrow, Subroc, Super Talos, Superman, Talos, Tartar, Tarzan, Telamon, Terrier, Thor, Thor Able Star, Thor-Agena, Thor-Delta, Tiny Tim, Titan, V-2, Viking, WAC-Corporal, Wagtail, Zuni, bully, bullyboy, colossus, giant, gorilla, muscle man, powerhouse, stalwart, strong man, strong-arm man, the mighty, the strong, tough, tough guy, tower of strength