The Northern Eggar is an upland form of the Oak Eggar (Lasiocampa quercus). The Oak Eggar generally has a one year life cycle whilst the Northern Eggar has a two year cycle, seeing such a large caterpillar at this time of year appears to be more consistent with a one year cycle. The split between Oak and Northern Eggars is complex I think.
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| Northern Eggar - caterpillar |
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