This weekend is The Big Garden Birdwatch - the world's biggest annual bird survey - and everyone, all over the world, can take part.
People are being asked to watch birds in their garden or local park for just one hour over January 24 and 25 and record the highest number of any one type they see. You can record the results by logging onto http://www.rspb.org.uk/birdwatch/index.asp.
The same website also has more information about the event, which is organised by the RSPB, and has pictures to help you identify birds you might see.
While you are doing that, you might want to try out a bit of ornithomancy - that's divination by observing the behaviour of birds.
This form of fortune telling was particularly popular in ancient Greece and Rome, but has been used by many other cultures throughout history. In Homer's epic the Odyssey, an eagle appears three times, each time flying to the right, gripping a dead dove in its talons. This augury was interpreted as meaning Odysseus was returning home and would deal with his wife's suitors.
Ancient Romans put great store on ornithomancy, and the priests who practiced it were extremely well regarded.
According to Divination for Beginners, by Scott Cunningham, Roman bird diviners would stand on a hill then, with a stick, indicate an area of sky in which omens were to appear. He would pour a libation of wine and offer a prayer to Jupiter "that there be signs within the boundaries I have prescribed".
Ornithomancy was seen as a complex subject to Romans, with types of birds, flight patterns, songs and behaviour adding layers of meaning. But here are a few basic ways of divining the future with the help of our avian friends.
In general, birds seen on the right bode well, but birds on the left are an ill omen. Four birds flying from left to right is the most auspicious sign.
Here is a short list of birds and what they mean:
Blackbird: A fortunate omen
Crow: Usually a bad omen, but if it cries three times it is favourable
Dove (or white pigeon): Highly fortunate, indicating peace, love and happiness
Duck: A sign of a stable relationship
Eagle: Not a common city bird, but one of the most important birds for omens. Usually indicates misfortune, but can represent power and strength and the matters of empires and leaders
Gull: You may soon travel
Magpie: Good or ill fortune depending on the number seen, as in the rhyme "One for sorrow, two for joy, three for a girl, four for a boy"
Robin: A sign of good fortune
Sparrow: Means domestic tranquility
Wren: The luckiest of birds, seeing a wren means good fortune will definitely come your way
Divination for Beginners: Discover the Techniques That Work for You (For Beginners (Llewellyn's))
Be Guided by the Birds and the Spiritual Messages They Bring