Dunnock the female. Males try to ensure their paternity by pecking at the cloaca of the female to stimulate ejection of rival males' sperm. Dunnocks take just one-tenth of a second to copulate and can mate more than 100 times a day. Males provide parental care in proportion to their mating success, so two males and a female can commonly be seen provisioning nestlings at one nest. Other mating systems also exist within dunnock populations, depending on the ratio of male to females and the overlap of territories. When only one female and one male territory overlap, monogamy is preferred. Sometimes,
Golding Bird classified by the chemistry of the nucleus, but determined that they all fell within two overall groups: organic stones caused by a misfunctioning bodily process, and excessive inorganic salts causing sediment on which the stone could nucleate. In 1842, Bird became the first to describe oxaluria, sometimes called Bird's disease, which is caused by an excess of oxalate of lime in the urine. This is the second most common cause of kidney stones, the first being uric acid and its ammonium salt. There are several others, such as ammonium oxalate. In his great work "Urinary Deposits", Bird devotes much space