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.

Crabs

 * Octopunch
 * Rampage (BW)
 * Razorclaw (BW)
 * Razorsharp
 * Rockbuster
 * Shokaract

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

Generation 1/Beast Era

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

Unicron Trilogy

 * Megatron
 * Predacon

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

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 molds with cheetahs)

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

Generation 1/Beast Era

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

Unicron Trilogy
Leobreaker / Nemesis Breaker

Generation 1/Beast Era

 * Headstrong
 * Ramhorn (G1)
 * Rhinox
 * Stranglehold

Unicron Trilogy

 * Backstop
 * Rhinox

Generation 1/Beast Era

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

Unicron Trilogy

 * Snarl (Cybertron)