- 105 hominid
- AMNH 6368
- AMNH 6524
- AMNH FARB 22965
- AMNH FR 1240
- AMNH FR 3999
- AODF0890 ornithopod
- Aadonyx
- Abdallahsaurus
- Abdarainurus
- Abditosaurus
- Abrderma
- Abyssosaurus
- Acadiocaris
- Acanthopleurella
- Acanthotretella
- Accueil
- Acheroraptor
- Achillobator
- Acrocanthosaurus
- Actiosaurus
- Adalatherium
- Adcrocuta
- Adelogyrinus
- Adelospondylus
- Adeopapposaurus
- Aeger
- Aelurodon
- Aenocyon
- African elephant
- African mammoth
- African wild dog
- Africanicus
- Afrotapejara
- Aglaophyton
- Agroecomyrmex
- Agujaceratops
- Agustinia
- Ahshislepelta
- Ailurarctos
- Ailuropoda
- Ailuropoda baconi
- Ailuropoda melanoleuca hastorni
- Ailuropoda microta
- Ailuropoda minor
- Ajnabia
- Akmonistion
- Alamosaurus
- Alamotyrannus
- Alanqa
- Alaskan troodontid
- Albalophosaurus
- Albertaceratops
- Albertosaurus
- Albinykus
- Alcovasaurus
- Aldama Centrosaurine
- Alexandronectes
- Alioramus
- Aliuslater
- Allocordyceps
- Allosauridae
- Allosaurus
- Almond Formation Ceratopsian
- Alopias grandis
- Altas Tortoise
- Altispinax
- Amagimi Dam Therizinosaurid
- Amargasaurus
- Amargastegos
- Amargatitanis
- American lion
- American woolly mammoth
- Americanicus
- Americanus
- Amphibamus
- Amphicoelias
- Amphicotylus
- Amphymenium
- Amtosaurus
- Anacodon
- Anaconda
- Anapuzosia
- Ancient vampire bat
- Andhrasaurus
- Andrewsarchus
- Angaturama
- Angeac ornithomimosaur
- Angel wings
- Angelosaurus
- Angloposeidon
- Angolasaurus
- Angusteryon
- Anhanguera
- Anhuilong
- Anisodon
- Anisopleurodontis
- Anjiaspis
- Ankarapithecus
- Ankylorhiza
- Ankylosaurus
- Ankylosphenodon
- Anomalocaris
- Anomalophiidae
- Anomodon
- Anomoeodus
- Anomoepus
- Anomotodon
- Anser
- Anser arenosus
- Anser arizonae
- Anser azerbaidzhanicus
- Anser cygniformis
- Anser djuktaiensis
- Anser oeningensis
- Anser pratensis
- Anser pressus
- Anser thompsoni
- Anser thraceiensis
- Antarcticoolithus
- Anthropopithecus
- Antifer
- Antlers Albanerpetontid
- Antrimpos
- Anurognathus
- Aoniraptor
- Apatosagittarius
- Apatosaurus
- Aphaenogaster
- Aphelicophontes
- Aphthoroblattina
- Aquilolamna
- Aquilonifer
- Arackar
- Aragonictis
- Aramornis
- Aratasaurus
- Archaehierax
- Archaeocyon
- Archaeophis
- Archaeoportunus
- Archaeopteris
- Archaeopteryx
- Archaeorhynchus
- Archaeovenator
- Archanthropus
- Archbishop
- Archelon
- Archidesmus
- Archimollusc
- Arctocyonides
- Arctodus
- Arctodus braziliensis
- Arctodus pamparus
- Arctodus pristinus
- Arctodus simus
- Arctodus simus simus
- Arctodus simus yukonensis
- Arctotherium
- Arctotherium angustidens
- Arctotherium wingei
- Ardeosaurus
- Argentavis
- Argentinosaurus
- Arimidelphis
- Aristonectes
- Armbruster's wolf
- Arostropsis
- Arrudatitan
- Arthropleura
- Asian elephant
- Asianicus
- Asiapator
- Aspidopleura
- Asprosaurus
- Astadelphis
- Asteroceras
- Asterolepis
- Asterotrygon
- Astorgosuchus
- Asymphylomyrmex
- Atlanthropus
- Atlantochelys
- Atlantohadros
- Atopodentatus
- Atopopsyllus
- Atractosteus
- Atreipus
- Atrociraptor
- Aublysodon
- Aucasaurus
- Aucornis
- Aurochs
- Aust Colossus
- Australasicus
- Australianus
- Australobarbarus
- Australopithecus
- Australotitan
- Australovenator
- Austriacopithecus
- Austriadraco
- Austrian cobra
- Austrolimulus
- Austroposeidon
- Austrosaurus
- Avalonianus
- Axestemys
- Aysheaia
- Azykhanthropus
- BHI Ornithomimid
- Bagaceratops
- Bagualia
- Bahariasaurus
- Bajadasaurus
- Bakonydraco
- Balaenoptera
- Balaenoptera bertae
- Balaenoptera cortesii
- Balaenoptera ryani
- Balaenoptera siberi
- Balaur
- Balhuticaris
- Balistes
- Balistes crassidens
- Balistes dubius
- Balistes lerichei
- Balistes vegai
- Balochisaurus
- Balticopta
- Baltimartyria
- Baltocteniza
- Bambiraptor
- Ban Krok Duean Ha Sinamiid
- Bananogmius
- Banded Allotoca
- Bandringa
- Banji
- Barackosaurus
- Barapasaurus
- Barinasuchus
- Barnes High Sauropod
- Barosaurus
- Baryonyx
- Bashanosaurus
- Batofasciculus
- Battus polydamas antiquus
- Bayan Shireh Formation Neoceratopsian
- Bayan Shireh velociraptorine
- Bayanshiree Tyrannosauroid
- Bayosaurus
- Becklespinax
- Beelemodon
- Beelzebufo
- Beibeilong
- Beipiaosaurus
- Bembicidiodes
- Beornus
- Bergamodactylus
- Bernissartia
- Berthasaura
- Bharitalasuchus
- Bhimaites
- Bicellum
- Biconcavoposeidon
- Bienvenue Sur Prehistoric Wiki
- Bienvenue sur Prehistoric Wiki
- Big Boy
- Big Sara
- Bihariosaurus
- Biscoveosaurus
- Bissektipelta
- Bissekty Therizinosaurid A
- Bissekty Therizinosaurid B
- Bisticeratops
- Blackhawk Tyrannosaurid
- Blancocerosaurus
- Blesa Styracosternan
- Bluebuck
- Blutwurstia
- Boca do Chapim baryonychine
- Bohaskaia
- Boletuoolithus
- Bombinator
- Bonapartesaurus
- Bonitasaura
- Borealopelta
- Boreonykus
- Boreopithecus
- Borophagus
- Bothriodon
- Botrioides
- Brachiosaurus
- Brachyprotoma
- Brachyrhinodon
- Bradshaw paintings bat
- Branchioplax
- Branta
- Branta dickeyi
- Branta esmeralda
- Branta hylobadistes
- Branta rhuax
- Branta thessaliensis
- Branta woolfendeni
- Bravasaurus
- Brevivulva
- Brisbane River cod
- Brohisaurus
- Broilina
- Brontopodus
- Brontornis
- Brontosaurus
- Brontoscorpio
- Brouweria
- Brushy Basin Ceratosaurian
- Brösmeli
- Bubonic plague-like bacteria
- Bugin Tsav Ornithomimid
- Bulbasaurus
- Burgessomedusa
- Burkesuchus
- Burmese Theropod
- Buru
- Bush dog
- CAGS-IG01-004
- CCG 20011
- CDM 002
- CDM 025
- CMN 59667
- CMN 8804
- CM 11338
- CM 3452
- CM 73372
- CM 9401
- CPC 278
- CPC 279
- CUGB P1202
- Cadoceras
- Cadochamoussetia
- Caedocyon
- Caelestiventus
- Calamopleurus
- Calamospondylus
- Calcancora
- Californian beaver
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