A new study found that humans have a tendency to kill that they have inherited from their related species. The study also showed that we have tamed over the years of evolution due to the fact that we became social “animals”.
In order to find out these links, the researchers decided to see how much of a killer a mammal is. That is why they observed over 1,000 species of mammals kill and get killed by their own families. They found a relation between the violence rate and the place in the evolution path of the animals.
They figured out that humans are particularly violent because they have the tendency to kill their own blood and this habit can be inherited.
The mammals that were put under observation had a rate of 3 out of 1000 deaths. This means that 3 mammals in 1000 were killed by their own kind. When it comes to early humans the rate is even bigger and it goes up to 20 deaths caused by other humans in 1000 deaths.
A period in which the rate was the biggest for humans, in the medieval period when it reached 120 out of 1000.
The good part is that we got less violent over the years. Now the rate is almost 13 of 1000. This number is not sure because it depends on many things.
The most interesting fact is that animals that were considered to make lots of kill are peaceful with their own kind. For example, the killer whale has a rate of almost 0 kills made by its own kind. Bats also have lower rate of violence.
The ones that are violent are chinchillas, lemurs and baboons that can have a rate of 100 of 1000 kills made by their own species. Humans tend to be less violent than these animals.
The researchers believe that there is a relationship between these rates and different species.
“We found that closely related mammal species tend to have similar levels of violence,” said the lead author, Jose Maria Gomez.
When we talk about animals the rate of violence is big because they need to be dominant and to have resources but when it comes to humans there is no specific reason for killing.
The rate of violence in the human kind has lowered because they have laws, they become social and they evolved.
Image source: Wikipedia