Xerus African ground squirrel, fast and highly social

Xantus's Hummingbird Vibrant bird native to Baja California’s forests

Xingu River Ray Freshwater stingray found in Brazil’s Xingu River

Xoloitzcuintli Hairless Mexican dog breed, revered for healing

Xenops Small bird, adept at hunting insects in trees

Xenopus African clawed frog, popular in biological research

Xenarthra Group including sloths, anteaters, and armadillos species

Xenoturbella Primitive marine worm with a simple body structure

Xeme Arctic tern, famous for long migratory flights

Xenoceratops Horned dinosaur, lived in Canada during Cretaceous period

Xenopus laevis Frog species, important in developmental biology studies

Xestobium Wood-boring beetle, known for "deathwatch" tapping sounds