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Home > News > Tags > mammal
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1. The largest brain belongs to the sperm whale: 7 kg (17.5 pounds). The blue whale, the largest animal on the planet, being twice longer and thrice heavier, has a brain weighing 5 kg (12.5 pounds). 2. Human brain has an average weight of 2.7 pounds (1.2 kg), variations between 1.1 and 1.4 kg being considered normal.... |
21 April 2008
10:12 GMT |
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Mammals evolved from reptiles, that's for sure. Primitive living mammals, the monotremes (platypus and spiny anteaters) clearly show this, via many traits, like egg-laying, bones, and... even their penises. But the reptiles from which mammals evolved no longer exist. In fact, if birds evolved from dinosaurs, the... |
19 April 2008
06:39 GMT |
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Mammals are supposed to have bloomed after the disappearance of the dinosaur, 65 million-year ago. During the dinosaur times, all mammals must have been shrew-like creatures hiding during the day and only getting out in the night to hunt for insects. But a fossil jawbone of Teinolophos, an 122 million-year old fossil... |
18 April 2008
09:15 GMT |
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When dinosaurs went extinct, the Neozoic (New life age) started. Life evolved towards what we experience today. 1. Paleogene (65-23 Ma) was the epoch when small mammals evolved to the high diversity we know today. Many groups perished without descendants. Birds and snakes, too, diversified greatly. The clime was some... |
17 March 2008
16:51 GMT |
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1. The platypus represents one of the most peculiar living mammals. And beyond peculiarity, it is really the most primitive living mammal, together with its relatives, the echidnas, forming the group Monotrema ("one orifice", as they have only the cloaca). They have many traits still common to reptiles, but not found... |
21 February 2008
14:06 GMT |
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Try to hold your breath for more than 2-3 minutes, and those around you will have to call the ambulance. But the sperm whale can dive for more than one hour to depths greater than 1,200 meters (roughly 4,000 feet), with average dives of 45 minutes, to depths of 600-1,000 meters (1,968 to 3,280 feet). Elephant seals c... |
20 December 2007
03:56 GMT |
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Your teeth pattern rooted within the first reptiles struggling to turn into mammals. A new fossil mammal species from the Jurassic era, during the full blown dinosaur evolution, reveals that the basic tooth pattern encountered in all mammal species today emerged independently at least twice in the past, and also poin... |
1 November 2007
03:48 GMT |
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Living underground is not that easy, requiring some special adaptations. Just look at the mole's humerus bones. "When seen in the lab, they are nothing like the long upper arm bones of any other mammal," said Samantha Hopkins, a paleontologist at the University of Oregon, investigating the evolution of burrowing... |
29 October 2007
06:31 GMT |
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Healthy and cheap milk could come as the result of a new discovery: both in women and cows, the secretion of the milk is stopped by serotonin ("the feeling good" hormone). "Knowing the chemical responsible for inhibiting milk production could help us to improve milk yields in other mammals," said lead researcher Dr. ... |
9 October 2007
05:53 GMT |
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Humans can hear sounds between 20 Hz and 20 kHz. Bats and dolphins go much further: they can hear sounds over 20 kHz (ultrasounds), while dogs and elephants hear sounds under 20 Hz (infrasounds). For 30 years, researchers stated various hypotheses on how specialized cells in the mammals' inner ear amplify sounds... |
30 July 2007
06:56 GMT |
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The planet made "bang!" and that was all. 65 million years ago, the killer asteroid destroyed all dinosaur life on our planet. But that led to the world of today, filled with placental mammals. This is the conclusion of a new research, in a long debate over when and where these mammals - from rats and whales to human... |
21 June 2007
02:51 GMT |
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This poison has made many victims amongst the sea-food consumers till now. The domoic acid is a toxin synthesized especially by microscopic diatoms and red algae. It was first isolated from a red alga named in Japanese "duomoi" and used against gut worms. But high levels kill you, too, not just the worms, as it attac... |
30 April 2007
05:39 GMT |
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We know that DNA is the hereditary molecule from which the genes are made of. But not all DNA represents genes. The non-gene coding and DNA patches with unobvious role have been regarded by scientists for long as junk and useless, a sort of evolutionary ballast. But a new research showed that this tiny, jumping DNA ... |
26 April 2007
09:29 GMT |
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You could have been born weighing a few grams and as big as a bean or yuckier from a soft-shelled egg...But instead of carrying you into a marsupium, your mother delivered a 3-5 kg (8-13 pounds) hunk, resembling a human being (more or less). That's because she fed you through an organ called placenta ("pie" in ... |
18 April 2007
06:33 GMT |
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The classical story is that dinosaurs dominated the Earth for hundreds of millions of years, until an asteroid collided into the Yucatan Peninsula and provoked 65 million years ago a mass extinction that permitted the ancestors of today's mammals to thrive.The asteroid part did occur, but now, the dinosaurs'... |
29 March 2007
06:56 GMT |
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First mammals roamed with the dinosaurs during the Mesozoic Era. Now, an American-Chinese team has dug a new species of ancestral mammal, 125 million years old, that represents a missing link, providing for the first time fossil evidence on how mammals developed their middle ear, one of the most distinctive traits of... |
15 March 2007
06:18 GMT |
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