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.

Arthropods

Crabs

• Cancix
• Octopunch
• Rampage (BW)
• Razorclaw (BW)
• Razorsharp
• Rockbuster
• Shokaract

Scorpions

Generation 1/Beast Era

• Double Punch (G1)
• Double Punch (BW)
• Pincher
• Poison Bite
• Sandstorm (BW)
• Scorpia
• Scorponok (G1)
• Scorponok (BW)
• Scorpulator

Unicron Trilogy

• Scorponok

Transformers (2007)

• Scorponok

Dinosaurs

Tyrannosaurus

Generation 1/Beast Era

• Grimlock (G1)
• Megatron (BW)
• Overkill
• Trypticon
• T-Wrecks

Unicron Trilogy

• Megatron
• Predacon

Mammals

Bats

• Clouder / Skar
• Mindwipe
• Nightscream
• Onyx Primal
• Optimus Primal
• Ratbat
• Sonar
• Soundwave (Mutant)

Bears (genus Ursus)

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

Gorillas (Gorilla gorilla)

Generation 1/Beast Era

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

Unicron Trilogy

• Optimus Prime

Go-Go-GoBots

• Beast-Bot
• Gorillabot

Panthers (genus Panthera... often sharing cheetah bodies)

• Catilla
• CatSCAN
• Cheetor / Tigatron / Ravage
• Panther
• Rampage (G1)
• Snarl (Classics)
• Toraizer

Lions (Panthera leo)

Generation 1/Beast Era

• Angela / Dark Eggleo / Eggleo
• Leonicus
• Leo Prime
• Prowl (G1) / Lio Junior
• Razorclaw (G1)
• Snarl
• Steeljaw
• Under-3
• Victory Leo

Unicron Trilogy Leobreaker / Nemesis Breaker

Rhinos

Generation 1/Beast Era

• Headstrong
• Ramhorn (G1)
• Rhinox
• Stranglehold

Unicron Trilogy

• Backstop
• Rhinox

Wolves/dogs (Canis lupus)

Generation 1/Beast Era

• Carnivac
• K-9 / Max-B / Wolfang (Maximal) / Wolfang (Predacon)
• Weirdwolf

Unicron Trilogy

• Snarl (Cybertron)
  
  
  From Teletraan I: The Transformers Wiki, a Wikia wiki.