Sharks - Their fins stick up the surface and they swim about harmlessly, they seem to be of great interest on the island itself though.
Flies - Fly around the garbage bins.
Fish - In the Shark Museum a taxidermy fish sits in a display case. A man in a Shark Costume holds one, to which your Poptropican can comment.
Fruit Bat - They normally hang upside down but will unhesitatingly attack a Poptropican, knocking them back.
Giant Caterpillar - It climbs about on a Shark Statue and will knock back the Poptropican if touched.
Great Beast - A large deceased creature only remaining as a fossil. It resembles a dinosaur and one of their bones is a require item to put Booga to sleep.
Great Booga Shark - A huge shark that traps its prey on Castaway Island. It wears a collar and has a hook on its fin. It eats coconuts that can be shot from a cannon and must be put to sleep to earn the island medallion. If the player attempts to get close, the fin will knock them back. It is also called "The Great Booga" or simply "Booga".
Fruit Bat Man - He is a man that is dressed as a fruit bat. He lives in the temple with the other fruit bats and seems to think that he is one as well. He helps you find the Old Bone.
Mechanical Mouse - It must be captured with moldy cheese and fed to Merlin. It will normally run away and hide.
Merlin - A robotic owl created by Mordred. It befriends the Poptropican and will follow it in most outdoor environments. It is later playable and used to defeat Mordred but is gravely injured. It is later repaired however.
Seagulls - They appear in random places and open their mouths when clicked on.
Seals - They appear in a lot of random places and also open their mouth when clicked on.
Dog - It is owned by a lady.
Stuffed Dodo Bird - Inside the Mews Mansion, you can find one.
Fish - A mounted fish appears in Mew's Mansion. Your Poptropican finds it creepy. Fish also appear if you look through the binoculars at Loch Ness.
Giant Squid - In the Cryptid Museum, you can find one in a huge glass container.
Chickens - In Puerto Rico, chickens appear on a farm. Chickens can be also seen dead in the monitor of the Chupacabra.
Frogs - Random frogs appear in Puerto Rico.
Spotted Goats - They appear when you're looking for the Chupacabra. Three are required to find it.
Goats - They appear when you're looking for the Chupacabra.
Snake - A snake that can be jumped on, it becomes dizzy when you stand on it.
Jersey Devil - One of the four Cryptids who appears in a window and flies away. It lays an egg and the eggshells are left for proof.
Raccoon - It lives in the attic of Mother Leeds' house. You originally mistake it for the Jersey Devil.
Chupacabra - One of the four Cryptids who is almost trapped by you to try and get proof. However, he attacks your Poptropican after breaking out of the trap and leaves a tooth behind for proof.
Bigfoot - One of the four Cryptids you find proof for. It gets captured and must be rescued.
Nessie - One of the four Cryptids which is seen in the first fake photo if you look closely. After you beat the expert dart player the second time, the barman gives you a penny whistle. Go on the boat and play the whistle when you are close to land and Nessie will appear. Take a picture for proof. Afterwards, it goes back into the sea and swims away. It could also be spotted in the sneak peek for Cryptids Island.
Grey Squirrel - One lives in the Pacific Northwest, next to Bigfoot's cave.
Woodpecker - It lives in a hole in a tree next to Bigfoot's cave.
Snake - A snake appears in Puerto Rico
Iguana - A large iguana sleeps on a farmer's house in Puerto Rico.
Dog - A black dog appears on a rock if you look through the viewfinder at Loch Ness. It appears to be a Scottish terrier. Another small dog also appears on a rock.
Ravens - The Raven Swarm item is a members-only card available in the Poptropica Store. Also the ringmaster of the carnival is called "Ringmaster Raven" and he owns a pet raven which can be seen in his tent.
Pig - A butter sculpture of a pig is seen.
Carnie Monsters - The carnies transform into various monsters:
Gelatin Monster - The lady at the Fried Dough stand changed into a living pile of gelatin.
Fish Monster - The man at the duck-fishing booth transformed into a green, aquatic creature with webbed feet and fins.
Brain Monster - The guy at the weight-guessing booth was transformed into a giant brain and spine with glasses and small tentacles.
Humanoid Monsters - The two men outside the Ringmaster's tent transformed into furry, green, pig-nosed, horned humanoids.
Puppet Monster - The man outside the Tunnel of Love transforms into a giant puppet. He also attacks you in the Haunted Lab and seems to hate light.
Muscular Monster - The lady at the Test Your Strength game transforms into a furry, tiger-like, muscle-bound creature.
Mounted Creatures - Mounted animals in the Haunted. Most appear to be crossbreeds of animals.
Seagull - It lives in a nest on top of the ship's mast.
Stonefish - A poisonous fish you must film down.
Barreleye fish - A fish with a bizarre appearance that you must film down.
Anglerfish - A deep-sea predatory fish you must film down.
Red Cuttlefish - Common cuttlefish.
Purple Cuttlefish - A rare cuttlefish you must film down.
Sea Dragon - A type of seahorse you must film down.
Red Fish - Small red fish you must use to lure the Anglerfish. They will follow you as you pass them.
Pink Sea Urchins - Bumping into these will scare away red fish which are following you.
Hydromedusa - A rare jellyfish that you follow into the deep. A group of them later short-circuit your submersible.
Whales - Seen in the ending scene background.
Episode 2: Fortress of the Deep
Small fish - Small red fish that follow and keep the goblin shark from attacking you.
Goblin shark - A monstrous shark that tries to attack you. You must lure it into a tank. This will power part of the doorway.
Hydromedusa - There are a few of them. You have to lure one into a tank and the others into power sockets in order to power another part of the doorway. They will shock you if you get too close and they disappear back to the start when they go off-screen.
Electric eel - It shocks you if you touch it.
Puffer fish - You have to fix the pipe system to transport it into the generator and power another part of the doorway.
Episode 3: Out of the Blue
Mutants - Many mutants are seen in the ship. They seem to be held in a type of suspended animation.
Leviathan - A particularly large eel-like mutant which escapes from its tank and attacks you.
Dinosaurs - Dinosaurs are seen in the ship's memory.