Animals were killed at the hands of the person directly.
Scientists from the state University of new York analyzed the cause of death more than 42 thousand animals in studies of wildlife since 1970, and determined that about 28% of them died at the hands of the person directly.
In the study, researchers focused on studies in which the life of animals and the cause of death in the wild was observed by using the methods of telemetry – on the body of the animal mounted sensors, applied color labels or assigned to a more complex monitoring system. All they managed to gather 1114 papers published from 1970 to 2018: they studied life on land living mammals, birds, amphibians and reptiles. Most of the works taken for analysis, focused on the use of telemetry to monitor animals in North America.
The researchers collected data on the age of the dead animals and causes of death: man-made or natural. To anthropogenic causes, scientists have attributed hunting, poaching, car accidents and more. In natural the reason scientists included hunger, death from predators, disease, accidents and others. For the birds was used additional anthropogenic category – deaths resulting from collisions with buildings and other structures built by man.
Scientists managed to establish the cause of death 42755 305 individuals of different species from more than 120 of thousands of animals that were considered during the research. It turned out that humanity had caused 28% of deaths. The most common cause of death of animals in the wild was predation (55%), and in the second place – hunting is permitted (17%). In addition, the researchers found that most at the hands of mankind are killed the adults, while babies most often become victims of predators.
The researchers also point out that 85% of all the works concerned North America. For example, poaching is widespread in Africa, but the continent was seen in less than 2% of the works selected for the meta-analysis.