A new study indicates that human behavior around 45,000 to 29,000 years ago contributed to a change in the composition of scavenging animal species living nearby. While smaller scavenging animals such as foxes and some bird species benefited from the presence of humans, large scavengers such as hyenas and cave lions tended to be displaced. A new study indicates that human behavior around 45,000 to 29,000 years ago contributed to a change in the composition of scavenging animal species living nearby. While smaller scavenging animals such as foxes and some bird species benefited from the presence of humans, large scavengers such as hyenas and cave lions tended to be displaced. Evolution Ecology Phys.org – latest science and technology news stories