1
Extracts are made from the underground tubers, which look like sweet potatoes.
2
Tilling only encourages it by breaking up underground tubers, each of which produces more plants.
3
The workers dig extensive networks of tunnels in search of underground tubers to feed the colony.
4
A likely answer is that Oreopithecus had specialised by eating energy-rich underground tubers and corms, or even aquatic vegetation, says Nelson.