Vertebrates Word Search Printable

A vertebrates vocabulary sheet with its key, from fish and amphibians to reptiles, birds and mammals.

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Vertebrates Word Search

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0 of 20 words found

TEETFEATHERSXQD

TOLTGMTRIEKNTEK

OATUNIBSCALESNV

COLDBLOODEDOALE

WOLOEKHDJROHMNR

WARMBLOODEDLPCT

BFSMILURUPNUHWE

OLWHRRPESTBNIYB

YIOGDTCFKIDGBRR

LEFISHFUULBSICA

OFWLGGERLEOJABT

MIELDSKELETONBE

INSSBACKBONEDVG

ISNMAMMALDSLLCG

PALTAEATOSPINES

This grid is wider and taller than its box. Slide it to see every letter.To drag, hold the first letter for a moment, then slide.Keyboard: Tab to the grid, arrow keys to move, Enter on the first and last letter.

BackboneBACKBONE
SpineSPINE
SkullSKULL
SkeletonSKELETON
FishFISH
GillsGILLS
FinsFINS
ScalesSCALES
AmphibianAMPHIBIAN
ReptileREPTILE
BirdBIRD
FeathersFEATHERS
MammalMAMMAL
MilkMILK
FurFUR
VertebrateVERTEBRATE
Warm-bloodedWARM-BLOODED
Cold-bloodedCOLD-BLOODED
LungsLUNGS
EggsEGGS

20 words from the Vertebrates Key Terms list.

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Answer key: Vertebrates Word Search

TEETFEATHERSXQD

TOLTGMTRIEKNTEK

OATUNIBSCALESNV

COLDBLOODEDOALE

WOLOEKHDJROHMNR

WARMBLOODEDLPCT

BFSMILURUPNUHWE

OLWHRRPESTBNIYB

YIOGDTCFKIDGBRR

LEFISHFUULBSICA

OFWLGGERLEOJABT

MIELDSKELETONBE

INSSBACKBONEDVG

ISNMAMMALDSLLCG

PALTAEATOSPINES

BACKBONE, SPINE, SKULL, SKELETON, FISH, GILLS, FINS, SCALES, AMPHIBIAN, REPTILE, BIRD, FEATHERS, MAMMAL, MILK, FUR, VERTEBRATE, WARM-BLOODED, COLD-BLOODED, LUNGS, EGGS

Next step Type in the animals from your own unit Scramble the same vertebrate words

All 119 words

Backbone and Skeleton 19

Backbone The row of vertebrae that guards the spinal cord.
Brain The control center of the nervous system, guarded by the skull.
Cartilage A firm, smooth tissue; most of a shark's inner frame is made of it.
Column With "vertebral" or "spinal", the row of bones that guards the main nerve pathway.
Cranium Another name for the skull.
Disc A pad that separates one vertebra from the next.
Hagfish An eel-shaped jawless sea animal with a skull but only traces of vertebrae.
Head The end of the body where the skull is.
Jaw One of the pair of hinged parts at the mouth, used to grasp food.
Limb A jointed, muscled part of the body such as a leg or an arm.
Notochord A springy rod in the embryo; the vertebrae take its place as they form.
Ribs The curved bones that form a cage around the heart and lungs.
Skeleton The frame that holds up an animal's body.
Skull The case around the brain, typically bony; cartilage in some fish and amphibians.
Spinal cord The long, thin tube of nerve tissue that runs inside the backbone.
Spine Another name for the backbone.
Tail The long, flexible part at the rear end of the body.
Tooth A hard structure in the jaw, used to break down food.
Vertebra One of the small bones that stack up to form the backbone.

Show all 119 words (100 more)

Fish and Amphibians 27

Amphibian A cold-blooded, four-limbed vertebrate; most kinds start life in water with gills.
Aquatic Spending all or most of life in water.
Axolotl A salamander that keeps its gills and stays in the water as an adult.
Bony Describes fish, such as eels and seahorses, whose skeletons are not mostly cartilage.
Caecilian A limbless amphibian shaped like a worm or a snake.
Cartilaginous Describes sharks and rays, whose skeletons are not made mostly of bone.
Coelacanth A lobe-finned fish, closer kin to four-limbed animals than to most fish.
Eel A long ray-finned fish; several unrelated fish are named after its shape.
Fins The thin body parts with which a fish swims, steers and keeps steady.
Fish A water animal with gills, a skull and fins, and no fingers or toes.
Frog A short-bodied amphibian with no tail.
Gills Organs that take dissolved oxygen out of water.
Larva A young form that looks very different from the adult it will become.
Lateral line A system of sense organs in fish that detects movement in the water.
Lobe-finned Describes the fish group with muscular limb buds, from which four-limbed animals arose.
Metamorphosis The marked change of body form as a tadpole turns into a frog.
Newt A salamander that moves between life in water and life on land.
Operculum The bony cover that protects the gills of a bony fish.
Ray-finned Describes the class that holds nearly 99 percent of living fish species.
Scales Small stiff plates that grow out of the skin of most jawed fish.
Seahorse A small upright bony fish with a curled tail that can grip.
Shark A cartilaginous fish with 5 to 7 gill slits on either side.
Skate A cartilaginous fish grouped with the rays, the closest relatives of sharks.
Slime The slippery stuff a hagfish releases from its skin to defend itself.
Swim bladder A gas-filled organ that lets a bony fish hold its depth.
Tadpole The larva of an amphibian, usually living in water with gills and a tail.
Toad The common name for a frog with dry, leathery, bumpy skin and short legs.

Reptiles and Birds 25

Alligator A large reptile with two living species, the American and the Chinese.
Amniote A reptile, bird or mammal: a four-limbed animal whose embryo grows inside a membrane.
Beak The bill a bird uses to peck, grasp, preen and feed its young.
Bird A warm-blooded vertebrate with feathers, a toothless beak and hard-shelled eggs.
Carapace The upper part of the shell of a turtle or tortoise.
Claw A curved, pointed growth on the tip of a toe or finger.
Crocodile A large reptile of the tropics that lives partly in water.
Dinosaur A member of the group whose only living members are the birds.
Feathers The body covering that sets birds apart from every other living group.
Flightless Describes a bird, such as an ostrich or a penguin, that cannot fly.
Gizzard A thick-walled muscular stomach that grinds up food in birds and crocodiles.
Keratin The tough protein that makes up scales, feathers, claws, hair and hooves.
Nest The spot where a bird lays and warms its eggs and brings up its chicks.
Ostrich The heaviest and largest living bird; it cannot fly.
Penguin A flightless seabird with flippers; nearly all kinds live in the Southern Hemisphere.
Plumage The whole covering of feathers on a bird.
Preen To clean and arrange the feathers with the beak.
Reptile A cold-blooded, air-breathing vertebrate with skin covered in scales or scutes.
Scutes Bony plates overlaid with horn, as on a turtle's shell or a crocodile's skin.
Shell The hard cover of a turtle, grown mainly from its ribs.
Snake A limbless reptile with a long body covered in overlapping scales.
Tortoise A reptile with a generally hard shell, into which it pulls its neck and head.
Tuatara A lizard-like reptile of New Zealand, the last living member of its order.
Venom A toxin that an animal delivers through a bite or a sting.
Wings The forelimbs of a bird, shaped for flight.

Mammals 24

Antler A growth of bone from the skull of a deer, shed and grown again each year.
Bat The only mammal capable of true, sustained flight.
Blubber The thick layer of fat under the skin of whales and seals.
Dolphin A mammal that lives in water, grouped with the whales and porpoises.
Echidna A quill-covered, egg-laying mammal, also called a spiny anteater.
Fur The soft, thick coat of hair on almost all mammals.
Gnaw To wear away with the teeth, as rodents do with incisors that never stop growing.
Hair A protein thread that grows from the skin; one of the marks of a mammal.
Hibernate To pass the winter in a state of little activity and low body temperature.
Hoof The thick, horny covering on the tip of a toe in some mammals.
Horn A lasting pointed growth on the head, with a core of live bone.
Human A primate, and so a mammal and a vertebrate.
Kangaroo A large marsupial native to Australia and New Guinea.
Live birth Being born as a baby, not hatched from a laid egg, as most mammals are.
Mammal A vertebrate with fur or hair that feeds its young on milk.
Mammary With "gland", the organ that makes milk.
Marsupial A mammal whose young are born undeveloped and grow in a pouch.
Milk The food that a mother mammal makes for her young.
Nursing Feeding a baby on its mother's milk.
Placental Describes the mammals whose young develop to a late stage inside the mother.
Platypus An egg-laying mammal of eastern Australia that lives partly in water.
Pouch The pocket on a mother marsupial's belly where her young are nurtured.
Whale A mammal that lives its whole life in the sea; the blue kind is the largest animal known.
Whiskers Stiff sensing hairs that help most mammals feel their surroundings.

Vertebrate Traits 24

Bone The hard, rigid material of most vertebrate skeletons; it also makes blood cells.
Breathe To take in oxygen, from water through gills or from air through lungs.
Cold-blooded Having a body temperature that varies with the surroundings.
Eggs Laid by every bird and by a few mammals, such as the platypus.
Endoskeleton A supporting frame on the inside of the body, overlaid by soft tissue.
Fly To move through the air on wings.
Hatch To come out of an egg.
Heart The muscular organ that pumps blood through the body.
Herpetology The study of amphibians and reptiles.
Ichthyology The part of zoology that studies fish.
Insulate To hold in body heat, as underfur and down do.
Lungfish A freshwater vertebrate with lobed fins that is able to breathe air.
Lungs The organs that take oxygen from the air into the blood.
Mammalogy The study of the animals that have fur and make milk.
Ornithology The study of birds.
Oviparous Describes an animal whose young develop in eggs outside the mother.
Oxygen The gas that gills take from water and lungs take from air.
Swim To move through water, as a fish does with its fins.
Temperature How hot or cold a body is; birds and mammals keep theirs stable.
Terrestrial Living mostly or entirely on land.
Vertebrate An animal with a backbone and a skull.
Viviparous Describes an animal whose young develop within the mother's body.
Warm-blooded Keeping a body temperature higher than the surroundings, as birds and mammals do.
Zoology The scientific study of animals.

How this list was compiled: Own work: the word list and every clue were written for this page. The facts in the clues and in the page's answers were checked on 2026-10-09 against English Wikipedia (CC BY-SA 4.0): Vertebrate (https://en.wikipedia.org/wiki/Vertebrate), Spinal column (https://en.wikipedia.org/wiki/Spinal_column), Fish (https://en.wikipedia.org/wiki/Fish), Amphibian (https://en.wikipedia.org/wiki/Amphibian), Reptile (https://en.wikipedia.org/wiki/Reptile), Bird (https://en.wikipedia.org/wiki/Bird), Mammal (https://en.wikipedia.org/wiki/Mammal), Warm-blooded (https://en.wikipedia.org/wiki/Warm-blooded), Invertebrate (https://en.wikipedia.org/wiki/Invertebrate), Chondrichthyes (https://en.wikipedia.org/wiki/Chondrichthyes), Hagfish (https://en.wikipedia.org/wiki/Hagfish), and the article on each animal, body part and trait in the list. Spellings and plain-word meanings were checked in Wiktionary (https://en.wiktionary.org/). Licence: own work

How it works

This vertebrates word search printable starts on 20 key terms, from Backbone, Skull and Gills to Mammal, Reptile, Amphibian and Warm-blooded. The ranks and the invertebrates are on the classification word search.

Read the full guide

A list for each kind of vertebrate

Fish and Amphibians, under Start from a list, has 27 words, from Gills and Fins to Tadpole and Axolotl. Reptiles and Birds has 25, among them Scutes, Carapace, Plumage and Gizzard. Mammals has 24, such as Whiskers, Marsupial, Platypus and Blubber.

Backbone and traits

Backbone and Skeleton has 19 words for the parts that make an animal a vertebrate: Vertebra, Skull, Spinal cord, Notochord. Vertebrate Traits has 24, among them Cold-blooded, Oviparous and Viviparous, and the studies from Ichthyology to Mammalogy.

Warm-blooded, Cold-blooded, Lobe-finned and Ray-finned hide without the hyphen: WARMBLOODED.

Questions and answers

What animals are vertebrates?

Every animal with a backbone and a skull: the fishes, amphibians, reptiles, birds and mammals, some 65,000 species in all. The backbone surrounds and protects the spinal cord, and the skull protects the brain.

Which vertebrates are warm-blooded?

Birds and mammals, which keep a stable body temperature. Most fish are cold-blooded, as amphibians and reptiles are, though a few large, active swimmers such as the white shark and tuna hold a higher core temperature.

What is the difference between vertebrates and invertebrates?

A vertebrate has a vertebral column; an invertebrate neither develops nor keeps one. Vertebrates are the minority: under five percent of the animal species so far described.

Do all vertebrates have bones?

No. The skeleton of a shark or a ray is made mostly of cartilage, and the hagfish has a skull but only rudimentary vertebrae.

Is there a printable vertebrates word search with an answer key?

Yes. It is a two-page printable on Letter or A4, and the second page is the answer key with each word ringed. With Show clues, not words ticked, Gills prints as "Organs that take dissolved oxygen out of water."

All 119 words

Backbone and Skeleton 19

Fish and Amphibians 27

Reptiles and Birds 25

Mammals 24

Vertebrate Traits 24

How it works

A list for each kind of vertebrate

Backbone and traits

Questions and answers

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