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The second documented case of a female shark bearing a live young without ever being exposed to the presence of a male has recently been recorded. But this doesn't mean that there haven't been such cases before, even though they were not observed and analyzed by specialists. But before all feminist sup... |
10 October 2008
11:17 GMT |
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The ancient Egyptians portrayed Anubis, the god of the dead, as a jackal-headed man. Jackals are species from dog's family included in the genus Canis, the same to which the wolf (and its offshoots, the dog and dingo), red wolf and coyote belong. First dog-relatives appeared to the end of the Eocene, 35 million ... |
5 February 2008
14:06 GMT |
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Why did humans' ancestors start to walk on two feet? The debate is more vivid than that if it was Britney Spears or not in her last video, and only in the last year it has come with several theories, from bipedal (two feet) walking in the tree of the orangutans, to energy saving. Now, add a new one: Lia Amaral, ... |
17 December 2007
06:24 GMT |
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Well, Adam Sandler won't father a Brad Pitt. But it seems that only Brad Pitt can father another Brad Pitt...This happens in the insect world as well.Attractive traits have been known to be passed on from parents to offspring, from cricket calls to peacocks' tails, but being really sexy is more complicated.... |
22 November 2007
05:21 GMT |
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This is the solution for healthier toddlers: going naked. At least this is what the team led by John Speakman at the University of Aberdeen, UK, found and presented in the Journal of Experimental Biology: nursing female mice with a shaved back delivered more milk, which enabled them to have heavier litters (11 offspr... |
20 November 2007
07:19 GMT |
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It is a reproductive paradox: giving birth to offspring just to eat them. But the behavior is widespread in many groups of animals, from bank voles and hedgehogs to house finches, wolf spiders and a lot of fish species. The paradox is increased by the fact that all these species are also very good parents for the res... |
15 November 2007
03:07 GMT |
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This tamarin monkey species is called Saguinus oedipus; but despite its name (from Oedip in the Greek mythology), the sons do not kill their father, nor do they mate with their mothers. These South American little monkeys, weighing just 450 g (one pound) and being 30 cm (1 ft) long, can live up to 11 years, having a ... |
8 October 2007
15:46 GMT |
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Yes, testosterone is the male sex hormone that makes males muscular, aggressive and horny. But what happens when the female is a 'package' of testosterone? Not only 'fully loaded', but with higher amounts than males have?This is the case of the spotted hyena. In fact, the clitoris of the spotted h... |
16 August 2007
13:16 GMT |
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These beasts made an elephant look like a mouse. Sauropod dinosaurs were big, but the titanosaurs were the biggest of all. Argentinosaurs, a South American titanosaur, was the largest and heaviest land animal ever. It lived in South America during the middle of the Cretaceous Period (around 100 million years ago). Ar... |
31 July 2007
04:53 GMT |
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If you're a monogamy adept, do not try to find it in nature, too. Even in cases of classical monogamy, it has been proven that the brides go outside the wedlock. The newest busted myth is that of the foxes. Researchers have considered foxes, wolves and coyotes (the dog like carnivores in the Canidae family) to b... |
26 July 2007
06:36 GMT |
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Sex and economics seem to be connected: animals tend to invest in their offspring according to their expected payoff. A team of behavioral ecologists at the National Museum of Natural History and the Laboratory of Evolutive Parasitology, Paris showed that, in the peafowl (Pavo cristatus), when females mated with att... |
23 July 2007
04:55 GMT |
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If your white wife gives birth to a Black child in Africa or a Mongoloid one in China, you wouldn't be very pleased. But there are mothers that change the coloration of their offspring according to the local environment. A team at the University of California, Santa Cruz, has discovered that female side-blotche... |
13 June 2007
09:16 GMT |
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Many observations on the animal behavior confirm that "animals just lack speech". In 1972, researchers witnessed an astonishing event involving wolves. A limping individual headed towards an abandoned den. His shoulder bore a deep wound. The next day, the researcher saw a big black male entering the den and regurgita... |
19 May 2007
07:32 GMT |
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