You’re playing an alphabet game, or a school project is due tomorrow, and the letter X stops everything cold. That happens to nearly everyone. The list of animals that start with X really is short, so this page hands you 20 of them, sorted into mammals, birds, fish, reptiles, insects, and dinosaurs. Take the one you need and move on.
Animals that start with X include the xerus, an African ground squirrel, plus the X-ray tetra, Xantus’s hummingbird, the xeme, the xolo dog, and the clawed frogs in the genus Xenopus. Almost every name here comes from Greek, from a collector called John Xantus, or from a river in Brazil.
Quick List of X Animals at a Glance
| Animal | Type | Where Found |
|---|---|---|
| Xerus | Mammal | Africa |
| Xoloitzcuintli (xolo) | Mammal, dog breed | Mexico |
| Xanthippe’s shrew | Mammal | Kenya, Tanzania |
| Xenarthra (group) | Mammals | The Americas |
| Xantus’s hummingbird | Bird | Baja California |
| Xeme (Sabine’s gull) | Bird | Arctic, migrates worldwide |
| Xenops | Bird | Central and South America |
| Xavier’s greenbul | Bird | Central Africa |
| Xinjiang ground-jay | Bird | China |
| Xantus’s murrelet | Bird | Pacific North America |
| X-ray tetra | Fish | South America |
| Xingu river ray | Fish | Brazil |
| Xestus sabretooth blenny | Fish | Indian and Pacific oceans |
| Xingu corydoras | Fish | Brazil |
| Xantus’s leaf-toed gecko | Reptile | Mexico, California |
| Xantusia (night lizards) | Reptile | North America |
| Xenopus (clawed frogs) | Amphibian | Sub-Saharan Africa |
| Xucaneb robber frog | Amphibian | Guatemala |
| Xami hairstreak | Insect | Mexico, Central America |
| Xuthus swallowtail | Insect | China, Japan |
| Xenoceratops | Dinosaur | Canada |
| Xiaosaurus | Dinosaur | China |
Why the Letter X Runs So Dry
English hates starting a word with X. Say “fox” or “lynx” and the letter sits there comfortably. Push it to the front and your mouth does something awkward. So it hides in the middle instead.
Nearly every one of the animals that start with X borrows its name from elsewhere. Greek does most of the work. Xantho- means yellow, xeno- means strange, xero- means dry. Xenarthra, the group holding sloths and anteaters, translates as “strange joints,” which describes the extra knobs along their lower spine.
Then there’s one man. John Xantus was a Hungarian who collected specimens along the coast of Baja California in the 1850s. Six species still carry his name today. A hummingbird, a gecko, a crab, a murrelet, and a lizard genus all trace back to him.
Brazil handles the rest. The Xingu River lent its name to a stingray and a catfish.
Compare that to the letter A, where you could rattle off 200 species without pausing. Our roundup of animals starting with A shows the gap plainly.
Mammals Beginning With X
Three mammals survive close inspection, and one of them is a dog.
- Xerus is a genus of African ground squirrels. They dig long burrows through dry savanna and hold their bushy tails overhead like a parasol while feeding out in the open.
- Xoloitzcuintli, usually shortened to xolo, is a hairless dog from Mexico with roughly 3,000 years behind it. Bare skin burns, so these dogs need sunscreen in summer and a coat in winter.
- Xanthippe’s shrew lives in dry scrub across Kenya and Tanzania. It looks like a mouse. It isn’t a rodent at all, and sits closer to moles and hedgehogs.
A fourth entry covers a whole group rather than a species. Xenarthra takes in sloths, anteaters, and armadillos. They burn energy slowly, which explains why a sloth moves the way it does.
Birds and Fish Carry Most of the X Names
Birds give you the widest pick.
Xantus’s hummingbird lives in one place only, Baja California. Look for black cheeks, a white stripe behind the eye, and a metallic call that carries a long way.
The xeme is the older name for Sabine’s gull. It nests on Arctic tundra, then flies far enough south to winter off Africa or South America. Small bird, enormous journey.
Xenops is a genus of three brown birds that creep up and down tree trunks in Central and South American forest, prying insects out of bark. Xavier’s greenbul is an olive songbird from African rainforest. The Xinjiang ground-jay lives in Chinese desert and would rather run than fly.
Fish supply four more. The X-ray tetra is the famous one, since its skin stays clear enough to show the spine and swim bladder underneath. The Xingu river ray is black with white spots and keeps a venomous barb in its tail. Two smaller ones finish the group: the xestus sabretooth blenny off Indo-Pacific reefs, and the Xingu corydoras, an armored catfish under 4 cm long that swims in little shoals.
Reptiles, Frogs, and Insects With X Names
Frogs in the genus Xenopus live in water full time across Africa south of the Sahara. Flat body, slimy skin, three claws on each back foot. The African clawed frog has been used in labs for close to a century and is still among the best studied amphibians anywhere.
Xantus’s leaf-toed gecko grips rock faces in Baja California and southern California. It has no eyelids, so it licks its eyes clean instead. Xantusia is the night lizard genus, and several species in it give birth to live young rather than laying eggs.
Insects give you two butterflies. The xami hairstreak is a green species from Mexico and Central America. The xuthus swallowtail is the yellow and black one you’ll spot across China and Japan. Guatemala’s Xucaneb robber frog skips the tadpole stage completely and hatches already shaped like a frog. The far end of the alphabet is much kinder, and our guide to animals that start with Z covers dozens of species most people can name off the top of their head.
Setting up a tank or terrarium for any of these? Talk to a vet who handles exotic species first.
Dinosaurs That Start With X
Most X lists skip fossils entirely, which is a problem if homework is involved.
Xenoceratops was a horned dinosaur from Alberta with spikes running along its frill. The name means “alien horned face,” because that frill looked nothing like the others found in the same rock. Xiaosaurus was a small plant eater from Jurassic China. Xuanhanosaurus came from the same time and place but ate meat and had heavy forelimbs. Xenotarsosaurus hunted in Argentina and got its name from odd ankle bones.
Need artwork for a project? Xenoceratops is the easiest of the four to find pictures of.
Where Animals That Start With X Actually Live
Drop these species onto a map and a pattern jumps out. Baja California alone accounts for four, every one of them collected by the same person.
Brazil’s Xingu basin holds two, both freshwater, both under pressure from dams built on that river. Africa south of the Sahara covers four more: the xerus, Xanthippe’s shrew, Xavier’s greenbul, and the whole Xenopus genus.
Hardly any of them overlap. You could fly to Kenya, Brazil, and Mexico and still miss half this list.
That’s worth saying out loud in a classroom. Kids assume anything starting with X must be rare and exotic. It isn’t. A ground squirrel and a family pet share the page with a stingray that can sting you.
How to Say These Names Out Loud
Here’s where most people freeze up. The rule is easy. An X at the front of these names nearly always sounds like a Z.
- Xerus is ZEER-us
- Xenopus is ZEN-oh-pus
- Xeme is ZEEM
- Xenoceratops is zen-oh-SERR-a-tops
- Xolo ignores the rule. Spanish spelling, so it’s SHOH-loh
Teachers running an alphabet week usually pair X with something gentler. Our list of animals beginning with U does the job, since U is thin as well but nowhere near this thin.
X Animals in Other Countries and Languages
Australia has no native animal whose common name starts with X, despite how often people search for one. Spanish lists reuse xoloitzcuintle and xenopus, since both keep their spelling. French lists reach for xérus and xiphias, the swordfish.
The shortage holds up in every major language. That’s why animals that start with X stay the hardest square on any alphabet chart, and why the same short list turns up wherever you look.
FAQs
What animal starts with X? The xerus, an African ground squirrel, is the clearest single answer. The X-ray tetra and the xolo dog work just as well in a quiz or word game.
Is there any animal that starts with X? Yes, around 20 to 25 documented ones. Several are genus names such as Xenops or Xenopus rather than individual species.
What fish starts with X? The X-ray tetra is the best-known. Others include the Xingu river ray, the xestus sabretooth blenny, and the Xingu corydoras.
Are there any dinosaurs that start with X? Four main ones: Xenoceratops, Xiaosaurus, Xuanhanosaurus, and Xenotarsosaurus.
What dog breed starts with X? The Xoloitzcuintli, or xolo, a hairless breed from Mexico thought to be about 3,000 years old.
Why are there so few animals beginning with X?
English rarely places X at the start of a word. Almost all X animal names come from Greek prefixes, the naturalist John Xantus, or Brazil’s Xingu River.
Common Questions About X Animals
What animal starts with X?
The xerus, an African ground squirrel, is the clearest single answer. The X-ray tetra and the xolo dog work just as well in a quiz or word game.
Is there any animal that starts with X?
Yes, around 20 to 25 documented ones. Several are genus names such as Xenops or Xenopus rather than individual species.
What fish starts with X?
The X-ray tetra is the best known. Others include the Xingu river ray, the xestus sabretooth blenny, and the Xingu corydoras.
Are there any dinosaurs that start with X?
Four main ones: Xenoceratops, Xiaosaurus, Xuanhanosaurus, and Xenotarsosaurus.
What dog breed starts with X?
The Xoloitzcuintli, or xolo, a hairless breed from Mexico thought to be about 3,000 years old.
Why are there so few animals beginning with X?
English rarely places X at the start of a word. Almost all X animal names come from Greek prefixes, the naturalist John Xantus, or Brazil’s Xingu River.
