The researchers said that this could be because the chick does not know that the arriving bird is their parent or a predator.

They claim this may help to put off potential predators such as other birds and snakes.

First described by the French naturalist Louis Jean Pierre Vieillot in 1817, the Cinereous Mourner is suffering declines and is believed to be vulnerable.

An estimated 10,000 mature adults live in the lowland rain forests of Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela.

Dr Londoño said: ‘The caterpillar we encountered measured 12 cm, which closely matches the size of the L. hypopyrra nestling.

‘The striking morphological similarity is the caterpillar’s orange ‘hairs’ with white tips, which match almost exactly the nestling’s elongated orange downy feather barbs with bright white tips.

‘The morphological appearance of an aposematic caterpillar was reinforced by behaviour – the caterpillar-like head movements of nestlings when disturbed closely resembles the movements of the aposematic caterpillar.’