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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Toronto Animal Services noted that the monkey species can carry a type of herpes dangerous to humans.

BBC: Ikea monkey heads to Canada primate sanctuary

"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

Forest fragmentation opens the door to invasive species such as the cowbird, a type of blackbird that normally prefers open land, said Bridget Stutchbury, a biologist at York University in Toronto who studies forest songbirds.

WSJ: Northeast drilling boom threatens forest wildlife