Popular beast alternate modes

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.

(NOTE: For the sake of saving space, characters on this list who share a toy mold are combined into a single line.)

Molluscs

Cephalopods

• Tako Tank
• Dead End (BWN)

Squids

• Tentakil (G1) / Tentakil (Masterforce) / Tentakil (Energon) / Scylla
• Claw Jaw / Scuba / Ikard

Arthropods

Insects

Stag beetles (family Lucanidae)

• Shrapnel (G1) / Zaptrap
• Chop Shop
• Insecticon (BW)
• Beetle
• Scarem

Scarabs and rhinoceros beetles (family Scarabaeidae)

• Bombshell / Salvo
• Barrage (Decepticon)
• Ram Horn / Motorarm
• Needler
• Insecticon (Energon)

Grasshoppers and locusts (order Caelifera)

• Kickback (G1) / Shothole
• Ransack (G1)
• Scourge (BW)

Spiders

Generation 1 / Beast Era

• Arachnid
• Tarantulas

Black Widow Spiders (Latrodectus mactans)

• Blackarachnia
• Arcee (G1)
• Crystal Widow

Animated

• Blackarachnia

Crabs

• Cancix
• Octopunch
• Rampage (BW) / Shokaract
• Razorclaw (BW) / Rockbuster
• Razor-Sharp

Scorpions

Generation 1/Beast Era

• Double Punch (G1)
• Pincher
• Poison Bite
• Scorpia
• Scorponok (G1) / BlackZarak
• Scorponok (BW) / Sandstorm (BW) / Double Punch (BW)
• Quickstrike (BW) (partially)
• Scorpulator

Unicron Trilogy

• Scorponok / Dark Scorponok

Transformers (2007)

• Scorponok

Fishes

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

Sawshark (genus Pliotrema and genus Pristiophorus)

• Sharp Edge

Dinosaurs

Tyrannosaurus

Generation 1/Beast Era

• Grimlock (G1)
• Overkill
• Megatron (BW) / T-Wrecks
• Trypticon
• Tyrannitron
• Terrorsaur (Classics) / Gnashteeth / Chromebite

Unicron Trilogy

• Grimlock (Energon)
• Megatron (Armada)
• Predacon (Armada)

Animated

• Grimlock (Animated)

Timelines

• Grimlock (Timelines)

Triceratops

Generation 1/Beast Era

• Slag
• Guiledart / Triceradon
• Knockdown (Classics) / Ironlunge

Dinobots

• Triceradon (Dinobots)

Animated

• Snarl (Animated)

Stegosaurus

Generation 1/Beast Era

• Snarl
• Slugfest
• Saberback / Striker

Dinobots

• Snarl

Velociraptor

Generation 1/Beast Era

• Dinobot / Grimlock / Thrustor
• Dinobot II / Rapticon
• Razor Claw

Dinobots

• Grimlock (Dinobots)

Pterosaurs

Pteranodon

Generation 1/Beast Era

• Swoop (G1) / Ravenus
• Terrorsaur / Fractyl
• Terranotron (BM)
• Graphy

Unicron Trilogy

• Terrorsaur (Armada) / Ravenus
• Swoop

Dinobots

• Terranotron (Dinobots)

Animated

• Swoop (Animated)

Dragons

Generation 1/Beast Era

• Megatron / Cryotek
• Deathsaurus
• Galvatron (BWII) / Unicron
• Nightscream (Classics) / Dragoyell
• Savage
• Snapdragon

Robots in Disguise

• Megatron

Unicron Trilogy

• Scourge

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

Snakes

Cobras (genus Naja and others)

• Cohrada
• Quickstrike (BW) (partially)
• Nightviper (even though vipers aren't cobras)
• Cobrabreast

Lizards

Generation 1 / Beast Era

• Geckobot
• Sky Shadow (BW) (partially)
• Buzzclaw (BW) / Buzzclaw (Timelines) / Dirge (Descent into Evil) / Virulent Clone / Repugnus (Universe)

Frilled lizard (Chlamydosaurus kingii)

• Iguanus (BW) / Crazybolt
• Reptilion

Unicron Trilogy

• Wreckloose

Birds

Eagles (order Accipitriformes)

• Squawktalk
• Eaglebreast
• Silverbolt (G1) / Skywarp (BW)
• Silverbolt (BW) (partially)
• Screech
• Dreadwing (Classics) / Wedge Shape

Condors (genus Vultur and Gymnogyps)
Generation 1 / Beast Era

• Laserbeak (G1) / Buzzsaw (G1) / Garboil / Sundor
• Silverbolt (BW)
• Blockrock

Unicron Trilogy

• Laserbeak (Cybertron) / Hell Buzzsaw

Hawks and falcons (order Falconiformes)
Generation 1 / Beast Era

• Hawkbreast
• Wingspan
• Doubledealer
• Airazor
• Sights

Unicron Trilogy

• Airazor

Mammals

Rodents

• Rattrap
• Packrat
• Night Glider / Dark Scream

Bats

• Batbreast
• Mindwipe
• Nightscream (BM)
• Nightshriek
• Noctorro (partially)
• Optimus Primal / Onyx Primal
• Ratbat
• Skar / Clouder
• Sonar
• Soundwave (BW)
• True One

Carnivores

Bears (genus Ursus)

• Chainclaw
• Grizzly-1 / Polar Claw / Survive
• Icebird
• Kuma Kinkin

Wolves / Dogs (Canis lupus)

Generation 1/Beast Era

• Carnivac
• Wolfang (Maximal) / Wolfang (Predacon) / K-9 / Max-B
• Weirdwolf
• Sixshot
• Quickstrike (BM)
• Overbite (Classics) / Gredator / Razorclaw (Timelines)

Unicron Trilogy

• Snarl (Cybertron)

Felines

Jaguars (Panthera onca)

• Ravage / Glit / Howlback
• Panther
• Battle Ravage (Energon)
• Jaguarbreast

Tigers (Panthera tigris)

• Rampage (G1)
• Snarl (Classics) / Apexis
• Tigerbreast
• Toraizer
• Tigatron
• Tigerhawk / Razorclaw (Universe) (partially)

Lions (Panthera leo)

• Angela / Dark Eggleo / Eggleo
• 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)

• Pounce
• Quickswitch

Cheetahs (Acinonyx jubatus)

• Cheetor
• Cataclysm
• CatSCAN

Sabertoothed cat (genus Smilodon)

• Catilla

Elephants

• Shuffler
• Ironhide (G1) / Santon
• Big Convoy / Black Big Convoy / Nemesis Prime (Universe)

Odd-Toed Ungulates

Rhinos

Generation 1/Beast Era

• Headstrong
• Ramhorn
• Rhinox (BW)
• Stranglehold
• Greatshot (partially)
• Rhinobreast
• Top-Heavy

Unicron Trilogy

• Backstop
• Rhinox

Even-Toed Ungulates

Bovines

• Tantrum
• Bisonbreast
• Bonecrusher (BW) / Bighorn
• Noctorro (partially)
• Longhorn (BM)

Primates

Gorillas (Gorilla gorilla)

Generation 1/Beast Era

• Apeface
• Apelinq
• Beastbox
• Optimus Primal
• Primal Prime

Unicron Trilogy

• Optimus Prime (Armada)

Go-Go-GoBots

• Gorillabot / Beast-Bot / Gorilla-Bot
  
  
  From Teletraan I: The Transformers Wiki, a Wikia wiki.