Some of these food sources are found underground, and using tools could help the monkeys locate and access them. It is known that chimpanzees (Pan troglodytes) in the wild use sticks to dig for ...

A 20cm deep windowbox is fine for salad leaves and 30cm for the Dig In carrots and beans ... extra nutrients or plant food; and water-retaining granules. Put a layer of stones, bits of broken ...