Idioms referring to Animals

A bee in ones bonnet        having a persistent thought
A dogs life                    a wretched time
Act the goat                    fool around
As the crow flies             in a straight line
Birds eye view                as seen from above
Black sheep                    bad one in the family
Chicken hearted            frightened or cowardly
Could eat a horse            very hungry
Crocodile tears                fake crying
Cry wolf                         false alarm
Dark horse                    someone with unknown or hidden qualities
Dog-eared pages            pages that are bent at the corners
Eats like a bird                 has a poor appetite
Fish out of water            uncomfortable or out of place
For the birds                    useless or rubbish
Frog in my throat            swelling in my throat
Get your goat                annoy you
Kill two birds with one stone        do two jobs at the same time
Kill the fatted calf                celebrate by having a party etc.
Let the cat out of the bag        to tell a secret
Lion-hearted                    brave
Make a mountain out of a mole hill        make a fuss about something unimportant
Packed like sardines             very crowded
Pig headed                        stubborn
Put the cart before the horse     do things backwords
Queer fish                         odd person
Rain cats and dogs                rain heavily
Ride the high horse            be snooty or stubborn
Smell a rat                        be suspicious
Sounds fishy                        sounds suspicious or odd
Spring Chicken                    someone young
Stir up a hornets nest            Interfere and cause trouble
Stool Pigeon                     An informer to the police
Whale of a time                 A great time
Wild goose chase                A hopeless task
Wolf in sheep's clothes         An evil person disguised as a good one