Learn more about royalty-free images. And search more of iStock's library of royalty-free stock images that features Adult photos available for quick and easy download. Images Photos Illustrations Vectors Video. Sexy mother, son and daugther stock photo Open comp. Description "sexy mother, son and daugther on green grass. This image is for editorial use only? Editorial use only photos don't have any model or property releases, which means they can't be used for commercial, promotional, advertorial or endorsement purposes. This type of content is intended to be used in connection with events that are newsworthy or of general interest for example, in a blog, textbook, newspaper or magazine article. Included with your subscription.
September 29, It is not the superior genes of the father, but the mother's resource investment in the eggs that makes Zebra Finch males particularly attractive. A Swiss-Australian research team lead by evolutionary ecologists at the University of Zurich has challenged the theory that females mate with superior males to obtain good genes for their offspring. In Zebra Finches, as in most other bird species , both parents contribute to offspring rearing. The social partner of a female, however, is not always the biological father of the young. And, as evolutionary ecologists from the University of Zurich and biologists from Macquarie University in Sydney have discovered, offspring sired by an extra-pair partner develop larger color ornaments and are more attractive to females than their social half-brothers. Up to now, the quality differences between social and extra-pair offspring have generally been assumed to reflect the genetic superiority of the extra-pair male. Indeed, females are believed to engage in extra-pair copulation with genetically superior males to obtain better genes for their offspring. Now, Barbara Tschirren, professor for evolutionary ecology at the University of Zurich, and her team have challenged the idea of the exceptional male.
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