These are some of the many old saying with animals, reptiles, insects etc. that I heard growing up from my Mom and my Grandma, and find it amazing just how many old saying there were that people come up with back in those days and the old sayings even using the animals, reptiles, insects etc. like I have used here made a lot of sense.

A bird in hand is worth two in the bush
A little bird told me
A cash cow
A dark horse
A leopard never changes his spots
Ants in their pants
As rare as hens teeth
As the crow flies
A wolf in sheep's clothing
Badger someone
Bats in the belfry
Bear hug
Beating on a dead horse
Beef it up
Bees knees
Being a Guinea pig
Being a scape goat
Bet on the wrong horse
Bird brain
Birds eye view
Birds of a feather, flock together
Black sheep of the family
Blind as a bat
Bull headed
Busy as a bee
Busy Beaver
Buying a pig in a poke
Cat and mouse game
Cat burglar
Cat got your tongue
Cat napping
Cats meow
Cats pajamas
Changing horses in the middle of the stream
Chicken hearted
Chicken livered
Chicken out
Clam up
Clean as a hounds tooth
Cock and bull story
Cooked their own goose
Copy cat
Cow eyed
Crazy as a June bug
Crazy as a loon
Crazy like a fox
Crooked as a dogs hind leg
Crying crocodile tears
Crying wolf
Curiosity killed the cat
Cute as a bugs ear
Cuter than a speckled pup under a little red wagon
Different kettle of fish
Dog and pony show
Dog Days of summer
Dog eat dog world
Dog in the manger
Dog tired
Don't count your chickens before they hatch
Don't have a dog in this hunt
Don't hound me
Don't let the bed bugs bite
Don't look a gift horse in the mouth
Dust bunnies
Eager beaver
Eating crow
Eats like a bird
Eats like a hog
Eats like a horse
Eats like a pig
Every dog has its day
Fat cat
Fight like cats and dogs
Fine as the hair on a frogs back
Flogging a dead horse
For the birds
Fraidy cat
Free as a bird
Frog strangler
Full as a tick
Gentle as a lamb
Get off your high horse
Get all your ducks in a row
Goes ape
Gone to the dogs
Got a bee in her bonnet
Got a frog in the throat
Go hog wild
Going whole hog
Go to bed with the chickens
Got butterflies in the stomach
Got a Charley Horse
Got eyes like an eagle
Got it straight from the horses mouth
Got other fish to fry
Got your goat
Grouchy as a bear with a sore tail
Hadn't seen in a coons age
Has a memory like an elephant
Has goose bumps
Happy as a lark
Has a cow lick
Having a whale of a time
Healthy as a horse
Hen pecked
Hold your horses
Horse feathers
Horse laugh
Horse of a different color
Horse play
Horse trading
If wishes were horses, beggars would ride
In dog years
In a gnats heel
In a pigs eye
In hog heaven
Innocent as a lamb
In the dog house
In two shakes of a lambs tail
It's only puppy love
Kangaroo court
Keep the wolves at bay
Keeping the wolf from the door
Knee high to a grasshopper
Knee high to a pup
Lame duck
Laughing like a Hyena
Lay down with the dogs, get up with the fleas
Leads a dogs life
Let the cat out of the bag
Let sleeping dogs lie
Lie like an old yeller dog
Like a dog chasing its tail
Like a bull in a China shop
Like a fish out of water
Like a fox left to guard the hen house
Like a herd of old turtles
Like closing the barn door after the horse is out
Like cooking frogs
Like a moth to the flames
Like a one horse town
Like pulling hens teeth
Like two love birds
Loaded for bear
Loan shark
Lonesome as a pole cat
Looks like a drowned rat
Looks like a pig's sty
Looks like the cat that just swallowed the canary
Lower than a snakes belly
Mad as an old wet hen
Madder than a hornet
Making a mountain out of a mole hill
Make a bee line
Make a monkey out of
Mean as a striped snake
Meek as a kitten
Monkey business
Monkey see, monkey do
More fun than a barrel of monkeys
Moves like a snail
Nervous as a long tail cat in a room full of rockers
Night owl
Not the only fish in the sea
One trick pony
Open a can of worms
One of these days the old worm is going to turn
Packed like sardines
Pigeon toed
Pig out
Playing possum
Pony up
Poor as a church mouse
Proud as a peacock
Putting on the dog
Putting the cart before the horse
Quick as a bunny thumper
Quite as a mouse
Rat on
Rat race
Riding a good horse to death
Road hog
Rolls off like water off a ducks back
Sacred cow
Scarce as hens teeth
Scaredy cat
She's not a spring chicken
Sick as a dog
Silly goose
Sings like a bird
Sitting duck
Slippery as an eel
Sly as a fox
Smell a rat
Snakes crawl at night
Snake in the grass
Snug as a bug in a rug
Stirred up a hornets nest
Stool pigeon
Strong as a horse
Strong as an Ox
Stubborn as a mule
Swims like a fish
Take the bull by the horns
Takes to like a duck to water
Talk turkey
The early bird gets the worm
The old blind sow finally found an acorn
There's a fly in the ointment
There's more than one way to skin a cat
The straw that broke the camels back
Tight as a tick
Till the cows come home
Throw to the wolves
Top dog
Tried to weasel out of it
Ugly duckling
Use some horse sense
Under dog
Watches like a hawk
Watches over like an old mother hen
Weak as a kitten
What's sauce for the goose is sauce for the gander'
When pigs fly
When the cats away the mice will play
When the chickens come home to roost
White elephant
Wild as a Mustang
Wild goose chase
Wild horses couldn't drag them away
Wise as an owl
Wolf down
Worked like a borrowed mule
Wouldn't harm a fly
You can lead a horse to water, but you can't make him drink
You can catch more flies with honey than you can with vinegar
You can't make a silk purse out of a sow's ear
You can't teach an old dog new tricks