@Sheril The correct answer is Homo Sapiens and unfortunately not surprising at all:

Humans have caused on average over 1,600,000 human casualties per year in major wars alone since WWI https://en.wikipedia.org/wiki/List_of_wars_by_death_toll

Moreover, the death and destruction that humans have caused to other species on this planet is beyond anyone's imagination.

Yet we must sustain hope and contribute to the development of a much more kind, considerate and humble coexistence.