At first glance, the brains of birds and mammals show many significant differences. (sciencedaily.com)
In birds and mammals evidence of an attachment bond is observed when «couples» engage in mutual tasks such as territory defense, nest building, feeding and parental chores. (scienceofrelationships.com)
The researchers noted that 26 % of the world's bird and mammal species are not reliably included in protected areas. (sciencedaily.com)