Құстар жұмыртқаларын, ұяларын және көбею мінез-құлқын зерттеу ғылымы

Branch of ornithology studying bird eggs, nests and breeding behavior

Oology (or oölogy), (/oʊ/'/ɒ//l//ə//dʒ//i/), is a branch of ornithology studying bird eggs, nests and breeding behaviour. The word is derived from the Greek oion, meaning egg. Oology can also refer to the hobby of collecting wild birds' eggs, sometimes called egg collecting, birdnesting or egging, which is now illegal in many jurisdictions.

Oology became increasingly popular in Britain and the United States during the 1800s. Observing birds from afar was difficult because high quality binoculars were not readily available. from the mid 20th century onwards it was increasingly regarded as being a hobby rather than a scientific discipline. In the 1960s, the naturalist Derek Ratcliffe compared peregrine falcon eggs from historical collections with more recent egg shell samples, and was able to demonstrate a decline in shell thickness.

Legislation, such as the Protection of Birds Act 1954 and Wildlife and Countryside Act 1981 in the United Kingdom, has made it impossible to collect wild birds' eggs legally. In the United Kingdom, it is only legal to possess a wild bird's egg if it was taken before 1954, or with a permit for scientific research; selling wild birds' eggs, regardless of their age, is illegal. In the 1980s and 1990s, the fines allowed by the law were only a moderate deterrent to some egg collectors. However, the Countryside and Rights of Way Act 2000 allowed for six months' imprisonment for the possession of the eggs of wild birds and, since it came into force, a number of individuals have been imprisoned, both for possessing and for attempting to buy egg collections. While the threat of imprisonment after 2000 encouraged some to give up egg collecting, and imprisoned twice. As recently as 2018, a man was imprisoned for amassing a collection of 5000 eggs, after previously being imprisoned in 2005. Another man was convicted of possessing 200 eggs in 2021. The Royal Society for the Protection of Birds has been particularly active in fighting illegal egg collection and maintains an investigative unit that collects intelligence on egg collectors and assists police in mounting prosecutions on them, in addition to investigating other wildlife crimes. In the United Kingdom, to avoid the possibility of prosecution, owners of old egg collections must retain sufficient proof to show, on the balance of probabilities, that the eggs pre date 1981. However owners of genuinely old collections are unlikely to face prosecution as experienced investigators and prosecutors are able to distinguish them from recently collected eggs. It is illegal to sell a collection, regardless of the eggs' age, so old collections may only be disposed of by giving the eggs away or by destroying them. Museums are reluctant to accept donations of collections without reliable collection data (i. e. date and place that they were collected) that gives them scientific value. Also, museums no longer put egg collections on public display.

In the United States, the collection and possession of wild bird eggs is also restricted, and in some cases is a criminal act. Depending on the species, the Migratory Bird Treaty Act, the Lacey Act, the Endangered Species Act, or other laws may apply.

When collecting eggs, normally the whole clutch of eggs is taken. Because eggs will rot if the contents are left inside, they must be "blown" to remove the contents. Although collectors will take eggs at all stages of incubation, freshly laid eggs are much easier to blow, usually through a small, inconspicuous hole drilled with a specialized drill through the side of the eggshell. Egg blowing is also done with domestic bird's eggs for the hobby of egg decorating.

Numerous books, and at one point a journal, have been published on egg collecting and identification: which took place at Bristol Museum, Towner Gallery in Eastbourne, and Leeds Art Gallery, in which they explored the 'social history' of oology in Britain. The exhibition included a vast recreation of an illegal egg collection, as well as a film narrating the history of egg collecting in Britain.