Largest insect - Meganeura monyi
Largest lagomorph - Nuralagus rex
Largest parrot - Heracles inexpectatus
Largest eagle - Haast’s eagle
Largest beaver - Castoroides ohioensis
Largest wolf - Bernard's Wolf
Largest hyaenid - Pachycrocuta brevirostris
Largest felid - Mosbach Lion & Machairodus lahayishupup
Largest tortoise - Megalochelys atlas
Largest ursid - Arctotherium angustidens
Largest vulture/teratorn - Argentavis magnificensis
Largest ape - Gigantopithecus blacki
Largest sparassodont - Proborhyaena gigantea
Largest macropod - Sthenurus stirlingi
Largest penguin - Anthropornis nordenskjoeldi
Largest flightless bird - South Island Giant Moa
Largest rodent - Josephoartigasia monesi
Largest equid - Equus giganteus
Largest bovid - Bison latifrons
Largest cervid - Cervalces latifrons
Largest lizard - Megalania prisca
Largest snake - Titanoboa cerrejonensis
Largest hippo - Hippopotamus gorgops
Largest turtles - Archelon ischyros
Largest camelid - Megacamelus merriami
Largest flying bird - Pelagornis sandersi
Largest sloth - Megatherium americanum
Largest dolphin - Baiji / Chinese River Dolphin
Largest giraffid - Bohlinia attica
Largest proboscidean - Palaeoloxodon namadicus
Largest Rhinocerotidae - Paraceratherium transouralicum
Largest crocodilian - Purussaurus brasiliensis
Largest squid - Tusoteuthis longa
Largest sirenian Hydrodamalis gigas
Largest shark - Otodus megalodon
Largest toothed whale - Livyatan melvillei
Largest baleen whale - B. sibbaldina
Credit to: Enbiya Zengin, RB Dahri World & Pachirisu Infinity Y.T. (formerly)
