Foster mother who got it wrong

 作者:司空唉     |      日期:2019-03-07 05:05:10
POLAR bear mothers may accidentally adopt other cubs because they are not very good at recognising their own. Evolutionary theory suggests that animals should adopt offspring they are related to, such as nephews or nieces. But a genetic study of polar bears by Nick Lunn of the Canadian Wildlife Service in Edmonton, Alberta, and his colleagues revealed that cubs recently adopted in the wild were completely unrelated to their adoptive mothers (Journal of Zoology, vol 251, p 23). Polar bears are usually solitary and their ability to identify their cubs might not be very well developed,