When arriving on Earth, there are millions of animal species a Cybertronian might scan for an alternate mode. Some genera, however, are extremely popular with Cybertronians.
Molluscs[]
Cephalopods[]
Squids (order Teuthida)
Arthropods[]
Insects[]
Stag beetles (family Lucanidae)
Scarabs and rhinoceros beetles (family Scarabaeidae)
Grasshoppers and locusts (order Caelifera)
Wasps and ants (order Hymenoptera)
- Waspinator / Dirgegun
- Buzz Saw
- Injector / Rartorarta (partially)
- Inferno (BW) / Antagony
- Scavenger (BW)
Spiders[]
Generation One / Beast Era
Black Widow Spiders (Latrodectus mactans)
Animated
Crabs[]
Scorpions[]
Generation One/Beast Era
- Double Punch
- Pincher
- Poison Bite
- Scorpia
- Scorponok (G1) / BlackZarak
- Scorponok (BW) / Sandstorm (BW) / Double Punch (BW)
- Quickstrike (BW) (partially)
- Scorpulator
Unicron Trilogy
Transformers (2007)
Fish[]
Manta Rays (Manta birostris)[]
- Seawing (G1) / Kraken / Terrormander / Seawing (Energon) (unreleased)
- Manta Ray (BW)
- Depth Charge
Sharks[]
Great White Shark (Carcharodon carcharias)
- Overbite (G1)/Sea Phantom/Overbite (Energon) (unreleased)
- Cybershark / Sky-Byte
Hammerhead Shark (genus Sphyrna)
- Cybershark / Hellscream / Overbite (Universe)
- Air Hammer (partially)
- Hammerstrike
Dinosaurs[]
Tyrannosaurus[]
Generation One/Beast Era
- Grimlock (G1)
- Overkill
- Gōryū (pretender shell only)
- Megatron (BW) / T-Wrecks
- Trypticon / Gigastorm
- Tyrannitron
- Terrorsaur (Classics) / Gnashteeth / Chromebite
Unicron Trilogy
Animated
Timelines
Triceratops[]
Generation One/Beast Era
- Slag
- Kakuryū (pretender shell only)
- Guiledart / Triceradon
- Knockdown (Classics) / Ironlunge
Dinobots
Animated
Stegosaurus[]
Generation One/Beast Era
Dinobots
Brontosaurus[]
Generation One/Beast Era
Ankylosaur[]
Generation One/Beast Era
Dinobots
Velociraptor[]
Generation One/Beast Era
Dinobots
Pterosaurs[]
Pteranodon[]
Generation One/Beast Era
- Swoop (G1)
- Graphy
- Yokuryū (pretender shell only)
- Terrorsaur / Fractyl / Lazorbeak / Hydra
- Terranotron (BM)
- Reptix
Unicron Trilogy
Dinobots
Animated
Dragons[]
Generation One/Beast Era
- Megatron (BW) / Cryotek
- Deathsaurus
- Galvatron (BWII) / Unicron
- Nightscream (Classics) / Dragoyell
- Savage
- Snapdragon
Robots in Disguise
- Megatron (RID) / Galvatron (RID)
Unicron Trilogy
Reptiles[]
Crocodylians[]
American alligator (Alligator mississippiensis)
- Skullcruncher
- Megatron (BW)
- Terragator (partially)
- Soundwave (BW)
- Gatoraider
Turtles[]
Snapping turtles (genus Chelydra and Macroclemmys)
- Snaptrap / Turtlar / Halfshell / Snaptrap (Energon)
- Snapper
- Terragator (partially)
Snakes[]
Cobras (genus Naja and others)
- Cohrada
- Quickstrike (BW) (partially)
- Nightviper (even though vipers aren't cobras)
- Cobrabreast
Lizards[]
Generation One / Beast Era
- Geckobot
- Sky Shadow (BW) / Drancron (partially)
- Buzzclaw (BW) / Buzzclaw (Timelines) / Dirge (Descent into Evil) / Virulent Clone / Repugnus (Universe) (partially)
Frilled lizard (Chlamydosaurus kingii)
Unicron Trilogy
Birds[]
Eagles (order Accipitriformes)
- Divebomb (G1)
- Squawktalk
- Eaglebreast
- Silverbolt (G1) / Skywarp (BW)
- Silverbolt (BW) / Windrazor (BW) (partially)
- Screech
- Dreadwing (Classics) / Wedge Shape
Condors (genus Vultur and Gymnogyps)
Generation One / Beast Era
Unicron Trilogy
Animated
Hawks and falcons (order Falconiformes)
Generation One / Beast Era
- Hawkbreast
- Wingspan
- Doubledealer / Doubleclouder
- Airazor
- Tigerhawk / Razorclaw (Universe) (partially)
- Air Hammer (partially)
- Sights
Unicron Trilogy
Mammals[]
Rodents[]
Bats[]
- Batbreast
- Mindwipe
- Nightscream (BM)
- Nightshriek / True One
- Noctorro (partially)
- Optimus Primal / Onyx Primal
- Ratbat
- Skar / Clouder
- Sonar
- Soundwave (BW)
- Megatron (RID) / Galvatron (RID)
Carnivores[]
Bears (genus Ursus)[]
Canines[]
Wolves / Dogs (Canis lupus)
Generation One/Beast Era
- Carnivac
- Wolfang (Maximal) / Wolfang (Predacon) / K-9 / Max-B
- Weirdwolf
- Sixshot
- Silverbolt (BW) / Windrazor (BW) (partially)
- Quickstrike (BM)
- Overbite (Classics) / Gredator / Razorclaw (Timelines)
Unicron Trilogy
Felines[]
Jaguars (Panthera onca)
Tigers (Panthera tigris)
- Rampage (G1)
- Snarl (Classics) / Apexis
- Tigerbreast
- Toraizer
- Tigatron
- Tigerhawk / Razorclaw (Universe) (partially)
- Bantor (partially)
Lions (Panthera leo)
- Angela / Dark Eggleo / Eggleo
- Lio Convoy / Black Lio Convoy
- Leobreaker / Nemesis Breaker
- Lionbreast
- Leonicus
- Prowl (G1) / Lio Junior
- Razorclaw (G1)
- Lionizer
- Snarl (BM) / Alpha Trion
- Lione
- Steeljaw
- Under-3
- Victory Leo
Pumas (Puma concolor)
Cheetahs (Acinonyx jubatus)
Elephants[]
- Shuffler
- Ironhide (G1) / Santon
- Torca / Elephorca (partially)
- Big Convoy / Black Big Convoy / Nemesis Prime (Universe 2003)
- Galvatron (RID)
Odd-Toed Ungulates[]
Rhinos[]
Generation One/Beast Era
Unicron Trilogy
Even-Toed Ungulates[]
Bovines[]
- Tantrum
- Bisonbreast
- Horri-Bull
- Bonecrusher (BW) / Bighorn
- Noctorro (partially)
- Longhorn (BM)
- Ramulus / Longhorn (Universe)
Primates[]
- Apache / B'Boom
- Bantor (partially)
- Optimus Minor
- Simon Furman (in a Titan Magazine, Starscream joked that Furman was a Maximal).
- Michael Bay (Hasbro made a toy of him, again as a joke).
Gorillas (Gorilla gorilla)
Generation One/Beast Era
Unicron Trilogy
Go-Go-GoBots
- Gorillabot / Beast-Bot / Gorilla-Bot