habitat

It may reflect the variety of habitats these fish occupy, from fast streams to still lakes.

The greatest threat these large carnivores face is habitat loss, while snaring and a declining prey base also play a role.

The Tacugama Chimpanzee Sanctuary has defied the threat of habitat loss and civil war to become the country's leading ecotourism destination and a model for environmental conservation across west Africa.

These habitats are shrinking due to many factors including development, erosion, wildfire and sea-level rise.

In such evolutionarily similar species, which share similar habitats and diet, "differences in genome size cannot easily be attributed to ecological or behavioural factors," says Professor Sara Guirao.