Rabbit

Shares many of the traditions of the hare

Passing in front of you - good luck

Passing behind you - bad luck

Running down a street - a house will catch fire

Keeping a rabbit's foot - good luck

Rat

Most relate to the rat's association with death

It is believed that rats can predict death

Rats leaving a ship - the ship will sink

Rats seen boarding a ship - lucky

Rats leaving a house - A death is iminent

A sudden arrival of rats in a house - the occupants will move soon, or (in Scotland) an occupant will come into money

An increase in numbers - an omen of war

Raven

Seen near a sick person - no recovery

Welsh belief - A raven on a chimney is good luck to those within

Ravens leaving The Tower of London - The United Kingdom will fall

Flying towards the sun - fine weather

Robin

Killing a robin - exremely bad luck

Causing a robin injury - a similar injury to the perpetrator

Entering a house or church - omen of death

Seagull

Killing a seagull - bad luck

Seen far inland - bad weather

Sheep

A shepherd counting his flock - bad luck

Sitting still on the grass - fine weather

Walking about and bleating - bad weather

Snake

Hanging a snake skin from the rafters - protection from fire

Crossing your path - unlucky

Carrying a snake skin - protection against illness

Carrying a snake's tooth - protection against fever and luck in gambling

Wearing an emerald - protection against snake bites

Sparrow

believed to embody the souls of the dead

Killing a sparrow - the tree it lived in will die

Hearing a sparrow call - rain

Spider

Killing a spider - very bad luck

Seen running over clothes - a new set of clothes

Keeping a money spider in the pocket or purse - attraction of money

Stork

Killing a stork - bad luck

Builing a nest on the roof - good omen

Seeing two storks - omen of pregnancy

Swallow

Herald of the summer

Killing a swallow - bad luck

Nesting on the roof - protection especially against lightning and fire

Storms will accompany the arrival and departure of swallows

information sources:

"Dictionary of superstitions" by David Pickering

"The encyclopedia of superstitions" by Christina Hole