Extinct Animals

Probably requires more than a passing interest in palaeontology.
Each animal group is – more or less accurately – in a descending order according to how long ago they lived (older ones come earlier).
Quiz by delucrist
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Last updated: November 11, 2014
First submittedNovember 11, 2014
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Try to guess the extinct animals from the clues provided.
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Synapsids and mammals
Famous sail-backed synapsid from the Permian.
Dimetrodon
The largest known gorgonopsid.
Inostrancevia
This suborder of therapsids gave rise to mammals.
Cynodontia
This smallish therapsid was the dominant land animal in the early Triassic.
Lystrosaurus
Order of rodent-like mammals that thrived from Jurassic to Oligocene.
Multituberculata
Hoofed Eocene predator; one of the largest carnivorous land mammals ever.
Andrewsarchus
Ancient predatory whale initially believed to have been a sea serpent.
Basilosaurus
The largest land mammal of all time.
Paraceratherium
Monstrous pig-like creatures; have been called "hell pigs".
Entelodonts
Miocene sperm whale relative; owner of largest teeth ever.
Livyatan
Huge proboscidean with downward-curving tusks on the lower jaw.
Deinotherium
The largest ape of all time.
Gigantopithecus
The human species that first learned to control fire.
Homo erectus
Recently discovered hominin that interbred with us and Neanderthals.
Denisovan
Large armored mammal from pleistocene South America.
Glyptodon
The largest saber-toothed cat of all time.
Smilodon
The largest bear of all time.
Short-faced bear
Powerful canid that lived in the Americas until about 10000 years ago.
Dire wolf
Huge sirenian hunted to extinction by Europeans.
Steller's sea cow
Large carnivorous marsupial that probably died out in the 20th century.
Thylacine
 
Dinosaurs and birds
The earliest known dinosaur.
Eoraptor
Supposed largest dinosaur of all time; known only from a single bone.
Amphicoelias
The "Velociraptors" of Jurassic Park were modeled after this dinosaur.
Deinonychus
The largest carnivorous dinosaur of all time.
Spinosaurus
Penguin-like aquatic toothed bird of the Cretaceous.
Hesperornis
This theropod dinosaur had the longest claws of any animal ever.
Therizinosaurus
The Torosaurus might simply be a mature form of this well-known dinosaur.
Triceratops
Small theropod known for its large brain; binocular vision and nimble fingers.
Troodon
Group of carnivorous flightless bird of South America.
Terror birds
Group of extremely large seabirds with tooth-like points in their beaks.
Pseudotooth birds
Giant raptor relative; possibly the largest flying bird ever.
Argentavis
The largest eagle of all time.
Haast's Eagle
The tallest bird of all time.
Moa
Once the most abundant bird in the world, it died out in 1914.
Passenger pigeon
 
Reptiles
Mesozoic marine reptiles with dolphin-like shapes.
Ichthyosaurs
Mesozoic marine reptiles known for their very long necks.
Plesiosaurs
The former's short-necked relatives; powerful apex predators.
Pliosaurs
Giant crocodilian from the early Cretaceous; possibly the largest ever.
Sarcosuchus
A prime rival in size to the former, this time from the late Cretaceous.
Deinosuchus
Dominant late Cretaceous marine reptiles.
Mosasaurs
The largest turtle of all time.
Archelon
The largest pterosaur of all time.
Quetzalcouatlus
The largest snake of all time.
Titanoboa
The largest terrestrial lizard of all time.
Megalania
This Pinta Island tortoise was for years the "rarest creature in the world".
Lonesome George
 
Fish and amphibians
Class of armored fish from the Paleozoic.
Placodermi
The largest of that group; a powerful apex predator.
Dunkleosteus
A famous Devonian fish with many tetrapod features.
Tiktaalik
Group of amphibians named after their peculiar tooth structure.
Labyrinthodontia
The largest bony fish of all time.
Leedsichthys
The largest cartilaginous fish of all time.
Megalodon
 
Invertebrates
Cambrian creature of unclear morphology; named for its dreamlike looks.
Hallucigenia
Predatory arthropod relative; possibly the largest creature of the Cambrian.
Anomalocaris
Diverse group of marine arthropods known throughout the Paleozoic.
Trilobites
Cephalopods with long, straight shells; abundant in the Paleozoic.
Orthocerida
Order of Paleozoic aquatic arthropods; some grew to gigantic sizes.
Eurypterida
Shelled cephalopods extremely common in the Mesozoic.
Ammonites
The largest land invertebrate of all time.
Arthropleura
Carboniferous dragonfly relative with a huge wingspan.
Meganeura
This locust formed the largest swarms known; died out in early 20th century.
Rocky Mountain locust
+1
Level 69
Mar 17, 2016
Love it. Perhaps you like the "Walking With" series as well? ^_^
+1
Level 68
Mar 25, 2016
loved it until "walking with cavemen", which was a joke.