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,
Everything which is not forbidden is allowed forbidden is compulsory." This quote has been suggested as a principle of physics. The claim that “everything which is not fobidden is allowed” is a principle only of English law does not stand the test of reality. In fact, it is a common principle of liberal democracies. In Germany, it has constitutional rank under Art. 2(1) of the GG which protects the general freedom to act (Allgemeine Handlungsfreiheit), as demonstrated e.g. by the judgment of the Bundesverfassungsgericht known as “Reiten im Walde” (BVerfGE 80, 137). Everything which is not forbidden is allowed "Everything which is not forbidden is allowed" is