Nigel Cattlin / Apple ermine moth (Yponomeuta malinellus) caterpillars inside a larval web on damaged and skeletonised apple foliage in an orchard, Berkshire, UK. June.
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Bernard Castelein / Green-veined white butterfly (Pieris napi) resting on Purple loosestrife (Lythrum salicaria), Brasschaat, Belgium. August.
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Bernard Castelein / Speckled bush cricket (Leptophyes punctatissima) resting on leaf, Brasschaat, Belgium. August.
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Bernard Castelein / Grayling butterfly (Coenonympha pamphilus) resting on St. John's wort (Hypericum perforatum) seedheads, Klein Schietveld, Brasschaat, Belgium. August.
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Joel Sartore / Photo Ark / Booted macaque (Macaca ochreata ochreata) pair. One animal is grooming the other before it stops and watches a fly. Safari North Wildlife Park, Brainerd, Minnesota. Captive.
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Joel Sartore / Photo Ark / Nubian soemmerring's gazelle (Nanger soemmerringii) male looking around. A fly is irritating the Gazelle, causing it to move its head erratically. Al Bustan Zoological Centre, Sharjah. Captive.
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Joel Sartore / Photo Ark / Bartram's scrub-hairstreak (Strymon acis bartrami) moving its antennae, Pine Rocklands, Florida, USA. Controlled conditions.
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Joel Sartore / Photo Ark / Gray's leaf insects (Pulchriphyllium bioculatum) moving their legs, Taman Mini, Jakarta. Captive.
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Guy Edwardes / Robber fly (Stenopogon sp.) feeding on hoverfly prey, near Bratsigovo, Bulgaria. May.
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Guy Edwardes / Robber fly (Stenopogon sp.) portrait, near Bratsigovo, Bulgaria. May.
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Guy Edwardes / Marbled orchard tortrix moth (Hedya nubiferana) resting on a leaf, Eastern Rhodope, Bulgaria. May.
