Animal idioms
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Monkey
To monkey around; Monkey business; To make a monkey out of someone. 
	Bee
Busy as a bee; The bee's knees; To have a bee in your bonnet.
	Dog
To be in the dog house; The hair of the dog; To make a dog's dinner of something.
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	Insect
Knee-high to a grasshopper; Butterflies in your stomach; Ants in your pants.
	Cat
There isn't enough room to swing a cat; To let the cat out of the bag; To put the cat among the pigeons.
	Pig
Pigs might fly; This place is a pigsty; To make a pig's ear of something 
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	Bird
Birdbrain; To have a bird's eye view; A little bird told me 
	Horse
To eat like a horse; Straight from the horse's mouth; To flog a dead horse 
	Fish
There's something fishy about this; A big fish in a small pond; A fish out of water.
 
					
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Most people walk in and out of your life, but only FRIENDS leave footprints in your heart