Idiomatic Expretion

BIRD
* as free as a bird = free, without worries
* a bird in the hand is worth two in the bush = más vale pájaro en mano que cien volando
* the early bird catches the worm = al que madruga Dios lo ayuda
* birds of a feather flock together = Dios los cría y ellos se juntan
* to kill two birds with one stone = matar dos pájaros de un tiro
* to eat like a bird = eat verylittle
* a bird's eye view = a vuelo de pájaro
* an early bird = a person who arrives or gets up early
* a bird of ill omen = un pájaro de mal agüero
* as the crow flies = in a straight line
* a little bird told me something = expression used to say that you know something but you will not say how you found out  = me contó un pajarito
CAT
* a cat has nine lives = ungato tiene siete vidas (Nótese que en inglés el gato tiene dos vidas más!)
* curiosity killed the cat (satisfaction brought it back) = it may be dangerous to be too curious
* to fight like cat and dog = to fight a lot
* has a cat got your tongue? = ¿te comieron la lengua los ratones?
* to let the cat out of the bag = to reveal a secret carelessly
* like a cat on hotbricks = very nervous
* no room to swing a cat = not enough space
* to have a cat nap = to have a short sleep
* to play cat and mouse with somebody = to keep somebody in uncertain expectation, treating him alternately cruelly and kindly
* when the cat's away, the mice will play = cuando el gato no está, los ratones se divierten
* all cats are grey in the dark = por la nochetodos los gatos son pardos
* to put/set the cat among the pigeons = to introduce somebody/something that is likely to cause trouble
* it's raining cats and dogs = it's raining a lot
* a cat in gloves catches no mice = gato con guantes no caza ratones
* hunt with cats and you catch only rats = you should choose you allies wisely
CHICKEN - HEN - STAG - COCK
* never count yourchickens before they are hatched = no cantes victoria antes de tiempo (lit. nunca cuentes tus pollos antes de que nazcan)
* which came first, the chicken or the egg? = it is difficult or impossible to decide which of two things happened first
* a chicken and egg situation = a situation in which it is difficult or impossible to decide which of two things happened first
* somebody'schickens have come home to roost = somebody's bad actions in the past cause problems now
* to run around like a headless chicken = to go from one place to another in a disorganized way
* chicken feed = small amount of money, almost useless
* to chicken out = to decide at the last moment not to do something because you are afraid
* chicken pox = illness which causes fever andspots on your skin = varicela
* somebody is no spring chicken = somebody is no longer young
* to behave like a hen mother = to be very protective
* a hen party = party for women only, usually the night before one of them gets married
* a stag party/night = party for men only, usually the night before one of them gets married
* a cock and bull story = an absurd and improbablestory, used as an excuse or explanation = un cuento chino
* to live like fighting cocks = to enjoy the best possible food
* cock of the walk = person who dominates others
 
DOG
* a dog's life = constantly worried, troubled or miserable
* every dog has his day = everyone can succeed sooner or later
* love me, love my dog = if one loves somebody, one should love everyoneand everything associated with him
* to be like a dog with two tails = to be very happy
* to give a dog a bad name (and hang him) = once a person has lost his reputation, it's difficult to regain it
* to go to the dog = (an organization) become less efficient
* to let sleeping dogs lie = to let it be quiet
* not to stand/have a dog's chance = to have no chance at all...