Researchers have seen evidence of altruistic-type behavior in several species, including marmosets, rats, and even ants.

研究人员在数类动物中发现了利他类型的特征，其中有狨、老鼠和蚂蚁。

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First described by Carl Linnaeus in 1758, Cygnus Cygnus can be considered a swan among swans, the type species, hence archetype, of all swans.

1758年，卡尔·林奈第一次描绘的天鹅——大天鹅，一直被人们视为天鹅中的天鹅，天鹅物种的代表，也是所有天鹅完美无瑕的原型。

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But no cone cells were observed in 10 of the 17 species, while only one type of cone cell appeared to be present in the other 7.

但是17种鲨鱼中有10种都没有视锥细胞，其他7种鲨鱼也都只具有一种单一的视锥细胞。

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"It is important because - depending on the rate of change, and the type of species that are found in the forests - it will influence a lot of ecosystem services and processes, " explained co-author Brian Enquist from the University of Arizona.

BBC: Tropical forests 're-shaped' by climate changes

One of the new specimens, known as KMN-ER 62000, has a face like the type specimen of Homo rudolfensis (the fossil that defines the species, if species it turns out to be), though it seems to be from an adolescent, whereas the type specimen is an adult.

ECONOMIST: Human ancestry has just got more complicated