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This article has been cited by other articles in PMC. Abstract Inclusive fitness theory provides the conceptual framework for our current understanding of social evolution, and empirical studies suggest that kin selection is a critical process in the evolution of animal sociality. A key prediction of inclusive fitness theory is that altruistic behaviour evolves when the costs incurred by an altruist c are outweighed by the benefit to the recipient b , weighted by the relatedness of altruist to recipient r , i. Despite its central importance in social evolution theory, there have been relatively few empirical tests of Hamilton's rule, and hardly any among cooperatively breeding vertebrates, leading some authors to question its utility.
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JFC's Birding

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Tit | Definition of Tit by Merriam-Webster

The long-tailed tit is a small, fluffy, pinkish bird; it would be the Bridget Jones of the bird world if only it were better fed. The flanks and shoulders are pink-brown; the eyes red; the wings black; and the tail, which is longer than the body, is black with a thin, white border. Like the English name, the Japanese name for the bird refers to the distinctive tail: Long-tailed tits are common residents of Japan, found from Hokkaido to Kyushu. They can be seen year-round.
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Aegithalidae

City birds tougher than their country counterparts November 27, Urban breeding birds appeared to cope better with the UK's cold, wet spring of than those living in woodland. Study shows some cuckoo birds may actually help their hosts March 21, Phys. In their paper published in the journal Science, the team describes how in studying Study reveals why timing of bird migration is changing November 12, Researchers at the University of East Anglia have found out why birds are migrating earlier and earlier each year. Climate change disrupts songbird's timing without impacting population size yet April 25, Songbird populations can handle far more disrupting climate change than expected.
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It is easily recognisable with its distinctive colouring, It is black and brown above and whitish below, with reddish flanks. It has a white crown and a tail that is bigger than its body, They are the only bird to have such a combination of tiny bill, round body, and a long stick-like tail. They are only 13—15 cm in length including its very long tail, which makes up 7—9 cm of the total. Found across the UK except for the far north and west of Scotland.
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