Breeding . Some magpies breed after their first year, while others remain in the non-breeding flocks and first breed in their second year. They are monogamous, and the pairs often remain together from one breeding season to the next. They generally occupy the same territory on successive years.
Mating takes place in spring. During the courtship display, the males rapidly raise and lower their head feathers, lift and open their tails like fans, and call in soft tones that are quite distinct from their usual chatter. They bring the loose feathers of their flanks over their primaries and spread their shoulder patch so that the white is conspicuous, presumably to attract females. Short, buoyant flights and chases then follow. Magpies prefer tall trees in which to build their bulky nests, firmly attaching them to a central fork in the upper branches. The framework of sticks is cemented with earth and clay, and the same material is used for the lining, which is covered with fine roots. Above this is a stout, though loosely built, dome of prickly branches with a single, well-concealed entrance. These huge nests are conspicuous when the leaves fall. Where trees are scarce, however, even in well-wooded areas, nests are sometimes built in bushes and hedgerows. In 2023, biologists discovered magpie nests made from anti-bird spikes. A nest found in
Antwerp, Belgium, now in the collection of
Naturalis Biodiversity Center, contains 1500 of these sharp metal spikes, made to deter birds. As they are placed in the dome of the nest to prevent
predation of their chicks, they seem to be used in the same way they were intended to be used, to deter other birds. In Europe, clutches are typically laid in April, and usually contain five or six eggs, though clutches with as few as three or as many as ten have been recorded. The eggs are usually laid at daily intervals in the early morning. On average, the eggs of the nominate species measure and weigh . Small for the size of the bird, they are typically pale blue-green, with close specks and spots of olive brown, but show much variation in ground colour and markings. The female incubates the eggs for 21–22 days, while the male feeds her on the nest. The chicks are
altricial, hatching nearly naked with closed eyes. They are brooded by the female for the first 5–10 days and fed by both parents. Initially the parents eat the
faecal sacs of the nestlings, but as the chicks grow larger, they defecate on the edge of the nest. The nestlings open their eyes seven to eight days after hatching. Their body feathers begin to appear after around eight days, and their primary wing feathers after ten days. For several days before they are ready to leave the nest, the chicks climb around the nearby branches. They fledge at around 27 days. The parents then continue to feed the chicks for several more weeks. They will also protect them from predators as they are unable to fly well, which makes them vulnerable. On average, only three or four chicks survive to fledge successfully. Some nests are lost to predators, but starvation is a more important factor causing nestling mortality. Magpie eggs in a clutch hatch at different times, so if the parents have difficulty finding sufficient food, the last chicks to hatch are unlikely to survive. Only a single brood is reared, unless disaster overtakes the first clutch. A study conducted near
Sheffield in Britain, using birds with coloured rings on their legs, found that only 22% of fledglings survived their first year. For subsequent years, the survival rate for the adult birds was 69%, implying that for those birds that survive the first year, the average total lifespan was 3.7 years. The maximum age recorded for a magpie is 21 years and 8 months for a bird from near
Coventry in England that was
ringed in 1925 and shot in 1947.
Feeding The magpie is
omnivorous, eating young birds and eggs, small
mammals,
insects, scraps and carrion,
acorns, grain, and other vegetable substances.
Roosting of magpies In winter, magpies mostly gather in groups in the evening and roost together. They may also roost alongside other bird species, such as starlings, thrushes, pigeons and western jackdaws.
Intelligence Along with other
corvids such as
ravens,
western jackdaws and
crows, the Eurasian magpie is believed to be not only among the most intelligent of birds, but also among the most intelligent of all animals. The Eurasian magpie's
nidopallium is approximately the same relative size as those in
chimpanzees and
humans, and significantly larger than those of the
gibbons. Their total
brain-to-body mass ratio is equal to most
great apes and
cetaceans. A 2004 review suggests that the intelligence of the corvid family to which the Eurasian magpie belongs is equivalent to that of the great
apes (
bonobos,
gorillas and
orangutans) in terms of social cognition, causal reasoning, flexibility, imagination and
prospection. Magpies have been observed engaging in elaborate social rituals, which may include the expression of grief.
Mirror self-recognition has been demonstrated in European magpies, making them one of only a few species known to possess this capability. The cognitive abilities of the Eurasian magpie are regarded as evidence that intelligence evolved independently in both corvids and primates. This is indicated by their use of tools, their ability to hide and store food across seasons,
episodic memory, and using their own experience to predict the behaviour of conspecifics. Another behaviour exhibiting intelligence is cutting their food in correctly sized proportions for the size of their young. In captivity, magpies have been observed counting up to get food, imitating human voices, and regularly using tools to clean their own cages. In the wild, they organise themselves into gangs and use complex strategies to hunt other birds and fend off potential predators. ==Status==