AS the US writer Nora Ephron wrote in the movie Heartburn, 'If you're looking for monogamy, you'd better marry a swan'. Some species of bird do, indeed, pair for life, yet other species including most songbirds are 'socially monogamous'. This means that, although they will form a pair for the entire breeding season, to help one another raise their young, the male (and, often, also the female) may also sneak off and try to mate with other birds.
In the male's case, this strategy is likely to mean he will have more offspring-even if he might never see some of them. For the female, mating with two or three males does not increase the number of chicks she can have, as she will still lay the same number of eggs. However, by mating with several males, she does benefit from having a range of young with different genetic qualities inherited from their fathers, some of which will be more likely to survive than others. This avoids, as it were, putting all her eggs in one basket.
Birds pair up by using two basic techniques. Songbirds, which make up more than half of all the world's bird species, have (as their name suggests) an attractive, tuneful song. This is almost always uttered by the male and serves two purposes: to attract and keep a female; and, at the same time, to warn nearby males to keep out of his territory and away from his mate.
Many larger birds, whose vocal talents are more limited, use a visual courtship display instead. This can be something quite basic, with the male simply showing off his attractive plumage to the female. Although it can also evolve into a truly memorable routine, in which both the male and female perform a complex series of dance moves, often exactly mirroring one another's movements. For humans, our own abilities to sing and dance were originally influenced by these incredible natural sounds and sights.
Esta historia es de la edición February 08, 2023 de Country Life UK.
Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.
Ya eres suscriptor ? Conectar
Esta historia es de la edición February 08, 2023 de Country Life UK.
Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.
Ya eres suscriptor? Conectar
Kitchen garden cook - Apples
'Sweet and crisp, apples are the epitome of autumn flavour'
The original Mr Rochester
Three classic houses in North Yorkshire have come to the market; the owner of one inspired Charlotte Brontë to write Jane Eyre
Get it write
Desks, once akin to instruments of torture for scribes, have become cherished repositories of memories and secrets. Matthew Dennison charts their evolution
'Sloes hath ben my food'
A possible paint for the Picts and a definite culprit in tea fraud, the cheek-suckingly sour sloe's spiritual home is indisputably in gin, says John Wright
Souvenirs of greatness
FOR many years, some large boxes have been stored and forgotten in the dark recesses of the garage. Unpacked last week, the contents turned out to be pots: some, perhaps, nearing a century old—dense terracotta, of interesting provenance.
Plants for plants' sake
The garden at Hergest Croft, Herefordshire The home of Edward Banks The Banks family is synonymous with an extraordinary collection of trees and shrubs, many of which are presents from distinguished friends, garnered over two centuries. Be prepared to be amazed, says Charles Quest-Ritson
Capturing the castle
Seventy years after Christian Dior’s last fashion show in Scotland, the brand returned under creative director Maria Grazia Chiuri for a celebratory event honouring local craftsmanship, the beauty of the land and the Auld Alliance, explains Kim Parker
Nature's own cathedral
Our tallest native tree 'most lovely of all', the stately beech creates a shaded environment that few plants can survive. John Lewis-Stempel ventures into the enchanted woods
All that money could buy
A new book explores the lost riches of London's grand houses. Its author, Steven Brindle, looks at the residences of plutocrats built by the nouveaux riches of the late-Victorian and Edwardian ages
In with the old
Diamonds are meant to sparkle in candlelight, but many now gather dust in jewellery boxes. To wear them today, we may need to reimagine them, as Hetty Lintell discovers with her grandmother's jewellery