human

"The Latin American countries are working very hard – we will not allow the gender programme to drop and allow human rights to be dropped," she told BBC News.

Moving forward, Hewlett hopes that this research offers a more nuanced understanding of the nature of social learning in humans and how cultures in general are conserved and change over time.

The main causes are the loss of habitat and food in landscapes shaped by humans as well as a high number of direct or indirect incidents of poisoning.

The energy that is being harvested as part of this research is being generated by squeezing amino acid molecules, the building blocks of proteins that exist in the human body.

Most interestingly, human listeners perceived the sound of the Aztec death whistle to be partly of natural and organic origin, like a human voice or scream.