Mullein moth caterpillars

Mullein moth caterpillars

Observation - Mullein moth caterpillars - UK and Ireland. Description: Big fat caterpillars about 5cm long. One of them was carefully pushing his droppings over the edge of the leaf - I am not sure why...

Big fat caterpillars about 5cm long.
One of them was carefully pushing his droppings over the edge of the leaf - I am not sure why...