Female moles evolved to have high testosterone levels, making them fiercer diggers and mothers. Female hyenas share this trait, but it means they must give birth through a male-like phallus.
We wanted to find out which biological phenomena are crucial for pattern formation and which are just incidental. These sorts of questions can be answered with mathematical modelling.
Great white sharks in South Africa have extremely low genetic diversity compared with shark populations elsewhere in the world.
Sara Andreotti/www.sharkdivingunlimited.com