Deer
Cowardly herbivores found in all sorts of forests. They run from larger mobs, but can be bred with wheat or carrots
Horseshoe Crab
These harmless living fossils can be found in beaches and oceans, and drop bonemeal and their meat when killed
Badgers
Badgers can be found in forests, savannas, and taigas, and will prey on smaller animals such as chickens. If attacked, badgers will throw dirt and other such materials at the attacker, on top of using their sharp claws
Squirrels
Squirrels are timid rodents found in forests. If frightened, they will flee and try to scurry up trees. They can be bred with seeds.
Boar
Boars are vicious piggies found in many biomes, including forests, jungles, and savannas. Some will attack larger creatures on sight, and most will attack smaller creatures like chickens and pheasants. Drop pork meat and sometimes their head.
Reindeer
Reindeer can be found in any cold biome, and can be bred with wheat or carrots. Reindeer can also be ridden!
More Lammergeiers
Lammergeier/Bearded Vulture
Large birds found in deserts and mountains. They eat bone marrow, and will grab skeletons and drop them down to break their bones open. They can be tamed with bones
Jellyfish
Jellyfish spawn in water and float aimlessly, but don't touch them! They will inflict poison and blindness!
Brown or Grizzly Bear
Black Bears
Tarantulas
Tarantulas spawn in deserts, mesas, and jungles, and are hostile. They may even fire some of their blindness-inducing hairs at enemies
Coyotes
Coyotes are opportunistic hunters and scavengers, and will even attempt to prey on players in the night. However, in the day they can be tamed with raw rabbit or chicken. They spawn in deserts, mesas, and plains.
Octopus
Neutral and befriendable cephalopods found in oceans. Give them fish and they will be quite powerful allies. That is, as long as you avoid the blue-rings
Giant Squid
Even bigger than their cohorts, and are much nastier. Some believe they can rip you from your boat in the night and crack your skull with their beak
Colossal Squid
Large, predatory squids found in deep oceans at night... don't get too close
Flying Fish
Whimsical fish found in warmer oceans, they may jump from the water and glide a bit
Piranha
Voracious fish found in jungle ponds. They only attack when their target is weak. Rumour has it they can strip a person or horse clean to the bones...
Barracuda
Aggressive predatory fish found in open waters in warmer climates. They are strong enough to break bones by ramming targets! Known for their attraction to shiny armor.