
Lulworth Skipper (Thymelicus acteon).

Small Skipper (Thymelicus sylvestris).

Large Skipper (Ochlodes sylvanus).
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In imperfect Batesian mimicry, the mimics do not exactly resemble their models. Many reasons have been suggested for this. Imperfect mimics may simply be evolving towards perfection. They may gain advantage from resembling multiple models at once. Humans may evaluate mimics differently from actual predators. Mimics may confuse predators by resembling both model and nonmimic at the same time (satiric mimicry). Kin selection may enforce poor mimicry. The selective advantage of better mimicry may not outweigh the advantages of other strategies like thermoregulation or camouflage. Only certain traits may be required to deceive predators...
https://en.wikipedia.org/wiki/Batesian_mimicry#Imperfect_Batesian_mimicry
The larva of the Hornet hoverfly can live happily in the nests of social wasps without getting stung! The hoverfly larva eats the debris and rubbish in the wasp nest and in return the wasps have a free cleaner...
This spectacular hoverfly first colonised Britain in the early 1940s, and was once regarded as rare. Since then it has become well established in London, the South and South East of England. As the climate warms the fly is heading north and has now been recorded in Cheshire.
https://www.buglife.org.uk/bugs-and-habitats/hornet-hoverfly