The collective noun for a group of Magpies is: a mischief of Magpies. Allegedly, the Magpie can recognise itself in a mirror. It has a reputation as a thief both in culture, e.g. The Thieving Magpie (Rossini), and with gamekeepers for taking eggs. Sightings of the bird are linked to superstition: “One for sorrow, two for joy…”. I have known people who actually have an antidote phrase they speak out whenever they see a group of Magpies.
The bare facts: There are 600,000 pairs in the UK and the population is growing as they adapt to more urban settings. The oldest ringed bird lived for more than 21 years. The bird appears as black and white, but when seen close up there is an iridescent blue/green sheen to the wings and tail. They will eat anything.
Stephen's Wildlife 