Yes here r some
X-Ray fish
X-Ray tetra
Xanclomys - a small mammal from the Paleocene of North America.
Xanthareel - yellow eel
Xantis - yak
Xantus - a bird
Xantusiidae (family of night lizards)
Xantus murrelet - a small seabird found in the California Current system in the Pacific Ocean.
Xeme - an artic fork-tailed gull.
Xenarthra - mammal in South America
Xenicidae (family of New Zealand wrens)
Xenopeltidae (family of reptiles including sunbeam snake- Xenopeltis)
Xenipirostris (genus of birds from Madagascar)
Xenops - a rain forest bird from the Americas
Xenopterygii (order of fishes including clingfishes)
Xenopus - a frog; toad
Xenurine - a species of armadillo; a cabassou.
Xenurus unicinctus - an armadillo native of the tropical parts of South America.
Xerus - a type of ground squirrel from Africa
Xiphias - a swordfish.
Xiphias gladius
Xiphosuran - a horseshoe crab.
Xoloitzcuintli - a dog
Xoni - mystical creature.
Xylophone Cat- A cat that is only by legend but some claim to have seen it
