Zoo Animals
Farm Animals
Cats and Dogs
Birds
Sea Creatures
100

Elephant in the room

Situation that everyone is aware of but no one wants to talk about

100

Hold your horses!

Wait a minute

100

Lucky dog

Lucky person

100

Watch like a hawk

Watch very closely

100

Fish out of water

Feeling out of place

100

Busy beaver

Someone who is very busy

100

Pig-headed

Stubborn

100

Cat got your tongue?

What you ask when someone is being quiet for no reason

100

Ducks in a row

Having everything organized

100

Something is fishy

Something is strange about a situation

100

Guinea pig

Test subject for something

100

You can lead a horse to water but you can't make it drink

You can prepare someone to do something but you can't make them do it

100

Let the cat out of the bag

Reveal a secret

100

The early bird gets the worm

The person who gets to a situation first is more likely to succeed

100

Big fish in a small pond

Someone who is important in a limited arena

100
A leopard can't change its spots

People don't often change

100

Don't look a gift horse in the mouth

Don't refuse an opportunity or a gift that someone gives you

100

Cat's meow

Something good

100

Night Owl

Someone who is more productive at night

100

Crocodile tears

Fake crying

100

Monkeying around

Fooling or joking around

100

Get Your Goat

Someone/something annoying 

100
You can't teach an old dog new tricks

It's difficult to add a new step to someone's routine 

100

Happy as a lark

Someone who is very happy

100

The world is your oyster

You can do anything you put your mind to