It's Friday the 13th, a day for many of you that holds a bit of distress and apprehension over unlucky events and occurences. However, I actually believe these days are lucky. I think it's all about what energy you put into the universe and how you direct it. Nevertheless, to celebrate the spirit of today, here are some interesting animal superstitions. If there's one that you like the most or is not listed below, please comment about it! I would love to hear any relevant superstition stories too.

Albatross

In the days of sail, an albatross flying round a ship in mid-ocean was an omen of wind and bad weather to come. It was very unlucky to kill it because it was thought to embody the restless soul of some dead mariner. BatsA bat means long life and happiness, a good omen, to the Chinese and Poles.
Bees
If a bee enters your home, it's a sign that you will soon have a visitor. If you kill the bee, you will have bad luck, or the visitor will be unpleasant. 
Birds
A bird that flies into a house, foretells an important message.
The white bird foretells death.
A bird call from the north means tragedy; from the south is good for crops; from the west is good luck; from the east, good love.
Butterfly

If the first butterfly you see in the year is white, you will have good luck all year.
Calf
If the first calf born during the winter is white, the winter will be a bad one. 
Cat
A black cat is lucky or unlucky, depending on where you live.
In Egypt it was believed that a black cat crossing one's path brought good luck.

If a black cat walks towards you, it brings good fortune, but if it walks away, it takes the good luck with it. 
Source: Old Wives Tales

A cat onboard a ship is considered to bring luck. 
Source: Old Wives Tales
A kitten born in May - a witches cat
Stray tortoishell cat - bad omen
Cats bought with money will never be good mousers
Cat sneezing once - rain
Cat sneezing three times - the family will catch a coldKilling a cat - sacrificing your soul to the Devil
Kicking a cat - Rheumatism

Cricket

A cricket is a lucky house spirit that takes it's luck away when it leaves.
Crows
One's bad, 
Two's luck, 
Three's health, 
Four's wealth, 
Five's sickness, 
Six is death.
Dogs

When a dog is staring intently, at nothing, for no apparent reason, look between the dog's ears and you'll see a ghost. 
Source: Dog Hause Visitor Martha Conolley (heard in West Virginia)When a dog howls in an otherwise silent night, it is said to be an omen of death, or at least of misfortune. A howling dog outside the house of a sick person was once thought to be an omen that they would die, especially if the dog was driven away and returned to howl again. A dog which gives a single howl, or three howls, and then falls silent is said to be marking a death that has just occurred nearby. 
Source: Vanessa's Pagan Place Folklore Page
Meeting a dog - good luck (especially dalmations)
A greyhound with a white spot on it's forehead - good fortune
Being followed by a strange dog - bad luck (especially black dogs)
A dog eating grass - rain

Dragonfly
Catching a dragonfly - marriage within the year

Eagle
Strength, divinity and immortality
Christian belief - symbol of ressurection
Several eagles flying together - peace
Eagles sitting motionless - an enemy approaching
Eagle egg eaten by two people - protection against witchcraft
Hearing the cry of an eagle - omen of death
Fish
Throw back the first fish you catch then you'll be lucky the whole day fishing.
Frogs

Frogs, like toads, were once thought to have peculiar properties, and were frequently used in healing charms, and in others of a slightly less innocent nature.A well known country cure for thrush was to hold a live frog with its head in the patient's mouth. As it breathed, so it drew the disease away and into itself. Warts could also be cured by rubbing a frog across them.HornetsIf the hornets build their nests high in trees during the summer, it will be a bad winter. If they build their nests low in bushes, it will be an easy winter. Source: Dog Hause Visitor Martha Conolley (heard in West Virginia)
Horses
Spotted horses are magical.
Grey horses and horses with four white socks are unlucky.
Horseshoes

A circular ring made from an iron horseshoe nail gives the same protection against evil as the horseshoe itself. The horseshoe or crescent moon shape was seen as a sign of good fortune and fertility. One legend says that the Devil called on St. Dunstan, who was skilled in shoeing horses. St. Dunstan recognized him and fastened him to a wall. He then set to work with such roughness that the Devil roared for mercy. St Dunstan turned the Devil loose after making him promise never to enter a home on which a horseshoe was fixed. Witches fear horses, so they are also turned away by a door with a horseshoe mounted on it, The horseshoe must be hung with the points up to keep the luck from spilling out.Horseshoes are considered lucky for their healing powers (cures hiccups) and for their protective influence (specifically against witches). It resembles the crescent moon and is thought to protect against the evil eye. Similar-shaped charms were used among the Chaldeans and the Egyptians. Related to animal worship, it approaches the form of a serpent biting its own tail-a universal symbol of eternity. There is a time-honored belief in the magical power of iron. Blacksmiths were often identified as sorcerers and the efficacy of fire as a bane to demons supported this idea.
A horseshoe, hung above the doorway, will bring good luck to a home. In most of Europe protective horseshoes are placed in a downward facing position, but in some parts of Ireland and Britain people believe that the shoes must be turned upward or "the luck will run out." 
Source: Old Wives Tales
A horseshoe hung in the bedroom will keep nightmares away. 
Source: Old Wives Tales

Ladybug
The bright scarlet ladybug is a luck-bringer, probably because it is traditionally associated by its color with fire. It is a sign of good fortune if one lands on a person's hand or dress. It must, however, be allowed to fly away of its own accord, and must not be brushed off.Landing on you - very good luck
Landing on your hand - Good weather
Number of spots - number of happy months ahead
Direction after it leaves your person - the direction from which your future love will come

Peacocks
A peacock feather has an evil eye at the end. Argus, the Greek legend, says a hundred eyed monster was turned into a peacock with all it's eyes in it's tail.
Rabbit's Foot
Because of the rabbit's ability to reproduce, the rabbit's foot also became a symbol of fertility. Rabbit's feet are also symbols of new life because of their prolificacy, they also were linked with darkness, witches and the devil because they live underground. By owning a rabbit's foot as a talisman, you would have vital connections with many powerful forces.
Seagull
Killing a seagull - bad luck
Seen far inland - bad weather

Sheep
To meet a flock of sheep on a journey is an omen of good luck. 
Sparrows

Sparrows carry the souls of the dead, it's unlucky to kill one.
Spiders

Superstitious people probably don't kill spiders because it has been unlucky since a spider spun a web over baby Jesus to hide him from Herod.When the spiders build their webs high, it's going to rain soon. 
Source: Dog Hause Visitor Martha Conolley (heard in West Virginia)
Swans

A swan's feather, sewed into the husband's pillow, will ensure fidelity.
Wolf
During the middle ages, wolves were ascribed magical powers and wolf parts became an important part of many early pharmacies. Powered wolf liver was used to ease birth pains. A wolf's right paw, tied around ones throat, was believed to ease the swelling caused by throat infections. 
Source: Dog Hause Visitor Paul Wigle (Wolf Country Web Site)

Sources:
The Dog Hause
http://www.angelfire.com/realm/swordandchalice/cerribits/animals/index.html

and other websites with the same exact information