1. Crab
   Snail
2. Cheetah
   Worm

This idiom references the fact that snails move incredibly slowly. It dates back to at least the 16th century when it was used in Shakespeare's "Richard III."

1. Lizard
   Bird
2. Quail
   Hamster

This phrase is used when someone told you something, but you don't want to say who it was. This allows them to remain anonymous.

1. Crow
   Worm
2. Cat
   Snake

Cat naps refer to short naps during the day. This is because cats sleep so much.

1. Dog
   Eagle
2. Shark
   Clam

This phrase means that competition is brutal and people will do anything to come out on top. No one is sure of the exact origin of this phrase.

1. Sheep
   Flies
2. Dolphins
   Hawks

Sheep generally follow a shepherd without causing too much fuss. When someone calls other people sheep, they mean that they are followers who don't think too hard about things.

1. Boar
   Worms
2. Mice
   Wolves

This phrase means to take an action that will create a whole new set of problems. No one is quite sure how it started.

1. Cockroaches
   Spiders
2. Pigs
   Sharks

This popular phrase goes back. It's used to express that the speaker thinks that whatever was suggested is impossible.

1. Ducks
   Eels
2. Goats
   Chickens

This phrase means to not get overexcited and overconfident about what you have before you are sure that you have it. After all, deciding all of your chickens will hatch when they are only eggs is risky.

1. Lions
   Whales
2. Snakes
   Horses

This means to be patient. You will often hear mothers saying it to children.

1. Fly
   Dingo
2. Crocodile
   Dog

This is an insult usually leveled at men. It is often applied to men who are unfaithful to the women they are involved with.

1. Bees
   Ants
2. Salmon
   Monkeys

This idiom is used to mean that somebody can't sit still. Usually, this is out of nerves or excitement.

1. Maggot
   Bee
2. Shark
   Dragonfly

This is a common English expression. It comes from Chaucer's "Canterbury Tales," which were written in the 14th century.

1. Dragon
   Oyster
2. Cow
   Jackal

This phrase means that you have many opportunities in front of you. After all, oysters may be hard to open, but occasionally they contain a beautiful pearl.

1. Bird
   Clam
2. Goat
   Worm

To clam up means to suddenly get quiet. You don't want to clam up at a job interview.

1. Pigeon
   Duck
2. Gecko
   Dog

The dog days of summer refer to the hottest part of the summer. This can often be heatwave that lasts days or more.

1. Wolves
   Geese
2. Flies
   Cows

This phrase can refer to dying, quitting or giving up quickly. It is usually only used to refer to multiple people or objects.

1. Squirrely
   Fishy
2. Doggy
   Froggy

If something is fishy it is odd, suspicious or not quite right. Use it when things seem off.

1. Cow
   Squid
2. Horse
   Goat

This means to not get upset. It usually refers to overreacting to minor issues.

1. Tuna
   Horse
2. Fly
   Lizard

To horse around means to play rough. Kids often do this.

1. Birds
   Lions
2. Gorillas
   Lobsters

This phrase is not literally about killing birds with stones. It means to solve two problems or get two things done at once.

1. Zebra
   Tiger
2. Cat
   Squirrel

This does not refer to a literal cat in a bag. It means to not reveal secrets.

1. Pig
   Lamb
2. Dinosaur
   Mammoth

To pig out means to eat a lot. This refers to the appetites of pigs.

1. Mouse
   Chicken
2. Clam
   Lamb

To chicken out means to back out on something due to fear. Cowardly people are also often called chickens.

1. Mice
   Alligators
2. Dogs
   Eels

This is not literal. It means that it's raining incredibly hard outside.

1. Clam
   Rat
2. Horse
   Shark

To smell a rat means to begin to think that something bad is going on behind your back. If you suspect trickery, you have smelled a rat.

1. Rat
   Seal
2. Lion
   Elephant

To rat someone out means to tell on them in order to get them in trouble. Rat is used in a few phrases related to double-crossing others.

1. Bat
   Pigeon
2. Chameleon
   Horse

If you hear something straight from the horse's mouth, it does not mean that a horse literally told you. It means that you got your information straight from the source.

1. Cow
   Lizard
2. Lobster
   Sheep

This is used as an exclamation. It usually expresses surprise or incredulity.

1. Crow
   Goose
2. Wasp
   Tiger

A wild goose chase describes a specific kind of chase. It means that someone is chasing after or trying to achieve something difficult or downright impossible.

1. Cat
   Squirrel
2. Lion
   Lizard

Copy cats are people who copy others. You will often hear this phrase used by children.

1. Swordfish
   Kitten
2. Hawk
   Lizard

This idiom means that someone or something is being watched incredibly closely. Hawks can see 2-8 times better than people.

1. Ducks
   Salmons
2. Owls
   Flies

This phrase means to straighten up and get everything together. It refers to the fact that baby ducks often walk behind their mother in a row.

1. Sheep
   Squirrels
2. Guinea pigs
   Tuna

If someone is being used as a guinea pig, it means they are being used as a test subject. This probably refers to the longstanding practice of animal testing in experiments, which often make use of rodents.

1. Foxes
   Dogs
2. Worms
   Parrots

This phrase means to leave things alone. Dogs are common in English idioms.

1. Tiger
   Porcupine
2. Shark
   Bat

While this phrase is used to describe someone who is blind, it is not correct. All species of bats can actually see to some extent.