Дельфины романтики: ухаживая дарят своим дамам букеты

Laguna

Dolphins woo females with bunches of weeds
By Nic Fleming, Science Correspondent
Last Updated: 6:01pm GMT 05/12/2007
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For men it is flowers and chocolates that are typically used to woo females but for dolphins it seems just a bunch of weeds will do the trick.
Have your say: What's your idea of a romantic gesture?

Bottlenose dolphins have been known to use tools
A new study shows that male dolphins carry pieces of plants and twigs to impress females, rather than simply playful behaviour as previously believed.
Object-carrying as part of sexual display is rare in the animal kingdom, with only humans and chimpanzees doing anything similar.
The fact that the habit has been observed in isolated populations of dolphins in river dolphins in Brazil, Venezuela and Bolivia suggests it has either been passed on through generations or evolved separately in different groups.
The discovery could provide proof of the existence of dolphin culture - defined as a non-hereditary, complex skill taught to some members of a population by others and passed down through generations.
Culture was until recently seen as a defining human characteristic not shared by other species.
Chimpanzees have been shown to exhibit these sorts of advanced behaviours, however the suggestion that dolphins also exhibit cultural behaviours is controversial.
Dr Tony Martin of the British Antarctic Survey in Cambridge, and Dr Vera da Silva, from the National Institute of Amazonian Research in Brazil studied 6,026 groups of dolphins in Mamiraua, a flooded rainforest reserve in Brazil.
Of these 221 groups included at least one individual carrying an object such as weed, a stick or a lump of clay.
These groups usually contained adult females, and the carriers were nearly always adult males. Aggression between males was also 40 times more likely in the object-carrying groups.
The researchers said that if the object-carrying was merely playfulness, females and juveniles would have been expected to carry objects too, however they did not.
They also carried out DNA analysis of tissue samples collected from adults and calves which backed up their theory.
Dr Martin, who is presenting his findings at a conference organised by the Socity for Marine Mammalogy in Cape Town, South Africa, this week, told New Scientist magazine: “I was struck by how many of the most frequent object-carriers were on the list of probable fathers of individual calves.
“It’s so unusual that many of my colleagues were sceptical when I first suggested the idea, but now I think the evidence is overwhelming.”
Bottlenose dolphins in Shark Bay, western Australia, break off pieces of marine sponge which they carry on their snouts to protect themselves as they probe the ocean floor.
It is the only known example of tool use among dolphins, and the scientists who made the discovery also concluded this was evidence of cultural behaviour.
Dr Michael Krutzen, from the University of Zurich in Switzerland, said: “I’m now convinced this behaviour is social learning - and from that point of view, you can call it a culture.”

inga-2002

многа букав иностранных :crazy:

stm6732463

a bunch of weeds
Данный предрассудок основан на неправильном переводе: слово "марихуана" перевели как "цветы". :) Дайте этому предрассудку настояться, и вы получите высказывания в духе:
Dr Michael Krutzen, from the University of Zurich in Switzerland, said: “I’m now convinced this behaviour is social learning - and from that point of view, you can call it a culture.”

:)
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