The
oak eggar (
Lasiocampa quercus) is a common
moth in the family
Lasiocampidae found in Europe and northern and western parts of Asia. The
larvae feed on a wide variety of plant species, low down, including blackthorn, hawthorn, viburnum, dogwood, ivy and ling, but are not known to feed on oak. They can be infected by
baculoviruses, which change their behaviour and cause them to climb out of the protection of low scrub and leave them open to predation, facilitating the spread of infection. Oak eggar larvae eventually
pupate on the ground inside a silken cocoon, the exterior of which is hard and yellowish, and resembles an
acorn, from which the common name "oak eggar" is derived. This oak eggar larva in the form of a fourth-
instar caterpillar, with a body length of 53 millimetres (2.1 inches), was photographed on a branch in
Keila, Estonia. The photograph was
focus-stacked from 59 separate images.
Photograph credit: Ivar Leidus
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