Random Animals
Farm Animals
Cats and Dogs
Birds
Sea Creatures
100

Goofing off (hint: Primate)

Monkeying around  

100

When something will likely never happen

When Pigs Fly 

100

It's difficult to change someone's routine/habits 

You can't teach an old dog new tricks 

100

To quit a bad habit immediately instead of gradually

Quitting cold turkey

100

There are lots of single people that you could potentially date

Plenty of fish in the sea

200

Someone who is very busy and working hard

Busy Bee

200

Stubborn as a...

Mule

200

What you ask when someone is being quiet for no reason 

Cat got your tongue?

200

Having everything organized

Having your ducks in a row

200

Something is strange about a situation 

Something is fishy

300

Test subject for something

Guinea Pig

300

You can give someone guidance and advice but you can't make them follow it

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

300

Reveal a secret 

Let the cat out of the bag

300

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

The early bird gets the worm

300

Fake crying

Crocodile tears

400

People don't really change (hint: big cat)

A leopard can't change its spots

400

The outcast or odd one in the family

Black sheep

400

When someone talks tough but won't get physically aggressive

All bark and no bite

400

Someone who is more productive at night 

Night Owl

400

Someone who is important in a limited arena

Big fish in a small pond

500

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

Elephant in the room

500

Wait a minute!

Hold your horses!

500

Embarrassed after losing or backing down from a challenge

Walk away with tail between the legs

500

Watch very closely 

Watch like a hawk

500

You have endless possibilities and opportunities to achieve your dreams

The world is your oyster