Doug Wechsler / Beewolf (Philanthus gibbosus) nectaring on flower, Pennsylvania, USA. July.

Doug Wechsler / Bald-faced hornet (Dolichovespula maculata) hibernating inside a log, Montgomery County, Pennsylvania, USA. November.

Doug Wechsler / Bald-face hornet (Dolichovespula maculata) drinking fermented sap (alcohol flux) from tree bark, Montgomery County, Pennsylvania, USA. September.

Doug Wechsler / Pure gold-green sweat bee (Augochlora pura) hibernating inside a log, Pennsylvania, USA. April.

Doug Wechsler / Two Ferruginous carpenter ants (Camponotus chromaiodes) on a Common jewelweed leaf (Impatiens capensis) sharing food with Aphids (Aphididae) they are tending, Bucks County, Pennsylvania, USA. Septembe...

Doug Wechsler / Ant (Vollenhovia emeryi) tending to larvae in nest, Montgomery County, Pennsylvania, USA. June.

Doug Wechsler / Ant bug (Alydus eurinus) resting on leaf, Bucks County, Pennsylvania, USA. August.

Doug Wechsler / Ant bug (Alydus eurinus) nymph, resting on leaf, Bucks County, Pennsylvania, USA. August.

Doug Wechsler / American toad (Anaxyrus americanus) male, waiting at roadside at night, Pennsylvania, USA. March.

Doug Wechsler / Blowfly (Calliphoridae) drinking fermented sap (alcohol flux) from tree bark, Montgomery County, Pennsylvania, USA. September.

Doug Wechsler / Parasitic fungus (Akanthomyces aculeatus) covering a moth (Lepidoptera), Pennsylvania, USA. September.

Doug Wechsler / Acorn weevil (Curculio sp.) larva inside White oak (Quercus alba) acorn, cross-section, Pennsylvania, USA. September.

Doug Wechsler / Hunting wasp (Zethus spinipes) resting on Mountain mint (Pycnanthemum sp.) flower, Four Mills Nature Preserve, Pennsylvania, USA. August.

Doug Wechsler / Yellowjacket (Vespula sp.) queen hibernating in rotten log, Wissahickon Valley Park, Pennsylvania, USA. September.

Doug Wechsler / Yellow warbler (Setophaga petechia) male, perched on branch, Magee Marsh Wildlife Area, Ohio, USA. May.

Doug Wechsler / Woodchuck (Marmota monax) feeding on an acorn from White oak (Quercus alba) tree, Morris Arboretum, Pennsylvania, USA. October.

Doug Wechsler / Wide-footed treehopper (Enchenopa latipes) resting on leaf, portrait, Pennsylvania, USA. August.

Doug Wechsler / White baneberry (Actaea Pachypoda) fruits, Letchworth State Park, New York, USA. September.

Doug Wechsler / Wedge-shaped beetle (Athyroglossa glaphyropus) resting on Mountain mint (Pycnanthemum sp) Four Mills Nature Preserve, Pennsylvania, USA. August.

Doug Wechsler / Wavy-lined emerald moth (Synchlora aerata), portrait, Cape May, New Jersey, USA. October.

Doug Wechsler / Ants (Vollenhovia emeryi) in nest tending larvae and pupae, Armentrout Preserve, Pennsylvania, USA. July.

Doug Wechsler / Five Vinegar flies (Mycodrosophila) and a Forest midge (Cecidomyiidae) resting on underside of Artist conk fungus (Ganoderma applanatum), Crossways Preserve, Pennsylvania, USA. July.

Doug Wechsler / Tree swallow (Tachycineta bicolor) migratory flock descending to feed on Bayberries (Myrica pensylvanica), Cape May, New Jersey, USA. October.

Doug Wechsler / Tree swallow (Tachycineta bicolor) flock resting on beach during southward migration, Cape May, New Jersey, USA. October.

Doug Wechsler / Tree swallow (Tachycineta bicolor) flock descending to feed on Bayberries (Myrica pensylvanica) during southward migration, Cape May, New Jersey, USA. October.

Doug Wechsler / Thick-headed fly (Physocephala tibialis) a wasp mimic, resting on leaf, Pennsylvania, USA. September.

Doug Wechsler / Taurus mason bee (Osmia taurus) covered in pollen, portrait, Pennsylvania, USA. May.

Doug Wechsler / Tachnid fly / Bristle fly (Juriniopsis adusta) resting on tree bark, Pennsylvania, USA. August.

Doug Wechsler / Bristle fly (Vibrissina sp.) parasitising Saw fly (Arge coccinea) larva, Wissahickon Valley Park, Pennsylvania, USA. July.

Doug Wechsler / Bristle fly (Gonia sp.) portrait, Pennsylvania, USA. April.

Doug Wechsler / Bristle fly (Gonia sp.) portrait, Pennsylvania, USA. April.

Doug Wechsler / Tachinid fly (Archytas metallicus) resting on a hand, Wissahickon Valley Park, Pennsylvania, USA. July.

Doug Wechsler / Flesh fly (Sarcophagidae) investigating a Tachinid fly (Archytas metallicus) on human skin, Wissahickon Valley Park, Pennsylvania, USA. July.

Doug Wechsler / Symphalan (Scutigerella sp.) in a rotten log, Wissahickon Valley Park, Pennsylvania, USA. April.

Doug Wechsler / American sycamore (Platanus occidentalis) with hollow trunk on banks of Wissahickon Creek, Montgomery County, Pennsylvania, USA. April.

Doug Wechsler / Panoramic view of the winding Susquehanna River taken from Wyalusing Rocks Scenic Overlook, Bradford County, Pennsylvania, USA. October, 2022.

Doug Wechsler / Square-snouted mustache ants (Strumigenys rostrata) in nest with larvae, pupae and eggs, Pennsylvania, USA. July.

Doug Wechsler / Stilt-legged fly (Rainieria antennaepes) resting on mossy log, Crossways Preserve, Pennsylvania, USA. July.

Doug Wechsler / Lesser yellowlegs (Tringa flavipes) with a group of Stilt sandpipers (Calidris himantopus) foraging in mudflats, Cape May, New Jersey, USA. October.

Doug Wechsler / Springtail (Isotomidae) in a rotten log, Camp Woods Preserve, Pennsylvania, USA. May.

Doug Wechsler / Spotted lanternfly (Lycorma delicatula) hanging from leaf, metamorphosing into adult form, Pennsylvania, USA. July.

Doug Wechsler / Spotted lanternfly (Lycorma delicatula) hanging from leaf, metamorphosing into adult form, Pennsylvania, USA. July.

Doug Wechsler / Group of Southern yellowjackets (Vespula squamosa) at nest entrance, Pennsylvania, USA. September.

Doug Wechsler / Group of Small carpenter bees (Ceratina sp.) sheltering inside Goldenrod (Solidago sp.) stalk (cross section), Pennsylvania, USA. September.

Doug Wechsler / Parasitic wasp (Orussus minutus) portrait, Morris Arboretum, Pennsylvania, USA. April.

Doug Wechsler / Two Sanderlings (Calidris alba) running along the shoreline, Higbee Beach Wildlife Management Area, New Jersey, USA. September.

Doug Wechsler / Rove beetle (Tachinus sp.) in a log, Camp Woods Preserve, Pennsylvania, USA. September.

Doug Wechsler / Forest midges (Cecidomyiidae) resting on strand of spider silk at base of tree, Armentrout Preserve, Pennsylvania, USA. July.

Doug Wechsler / Three Forest midges (Cecidomyiidae) resting on strand of spider silk at base of tree, Armentrout Preserve, Pennsylvania, USA. July.

Doug Wechsler / Robber fly (Leptogaster sp.) tangled up with another predatory fly in a spider's web, Camp Woods Preserve, Pennsylvania, USA. July.

Doug Wechsler / Rhubarb weevil (Lixus concavus) resting on leaf, portrait, Pennsylvania, USA. May.

Doug Wechsler / Red-winged blackbirds (Agelaius phoeniceus) pair, female in foreground, feeding, Magee Marsh Wildlife Area, Ohio, USA. May.

Doug Wechsler / Red flat bark beetle (Cucujus clavipes) head portrait, Pennsylvania, USA. May.

Doug Wechsler / Red flat bark beetle (Cucujus clavipes) resting on bark, Pennsylvania, USA. May.

Doug Wechsler / Signal flies (Pseudotephritis approximata) pair, laying eggs in tree bark, Camp Woods Preserve, Pennsylvania, USA. August.

Doug Wechsler / Signal fly (Pseudotephritis approximata) female, laying eggs in tree bark, Camp Woods Preserve, Pennsylvania, USA. August.

Doug Wechsler / Prothonotary warbler (Protonotaria citrea) male, perched on branch, feeding, Magee Marsh Wildlife Area, Ohio, USA. May.

Doug Wechsler / Prothonotary warbler (Protonotaria citrea) male, perched on branch, singing, Magee Marsh Wildlife Area, Ohio, USA. May.

Doug Wechsler / Two Ponerine ants (Ponerinae) in nest in rotten log, with eggs, larvae and pupae, Armentrout Preserve, Pennsylvania, USA. July.

Doug Wechsler / Podurmorph springtails (Hypogastrura sp.) in rotten log, Camp Woods Preserve, Pennsylvania, USA. October.

Doug Wechsler / Pigeon horntail (Tremex columba) female, laying eggs on tree bark, Camp Woods Preserve, Pennsylvania, USA. September.

Doug Wechsler / Philadelphia vireo (Vireo philadelphicus) perched on branch feeding on Dragonfly (Odonata) prey, Magee Marsh Wildlife Area, Ohio, USA. May.

Doug Wechsler / Chalcidoid wasp (Ooencyrtus kuvanae) resting on Gypsy moth (Lymantria dispar) egg mass, New Jersey, USA. August.

Doug Wechsler / Oleander aphid (Aphis nerii) alates and nymphs on Common milkweed (Asclepias syriaca) leaf, Pennsylvania, USA. July.

Doug Wechsler / Oak apple galls formed by Gall wasp (Amphibolips sp.) Pennsylvania, USA. May.

Doug Wechsler / Nomad bee (Nomada sp.), a Yellowjacket mimic, resting on dried leaf, Camp Woods Preserve, Pennsylvania, USA. April.

Doug Wechsler / Mosquito (Culicidae) larvae in treehole cavity, Camp Woods Preserve, Pennsylvania, USA. June.

Doug Wechsler / Northern mockingbird (Mimus polyglottos) mobbing a Red-tailed hawk (Buteo jamaicensis) perched on telephone wires, Pennsylvania, USA. June.

Doug Wechsler / Northern mockingbird (Mimus polyglottos) mobbing a Red-tailed hawk (Buteo jamaicensis) perched on telephone wires, Pennsylvania, USA. June.

Doug Wechsler / Mexican grass-carrying wasp (Isodontia mexicana) resting on Mountain mint (Pycnanthemum sp.) flower, Four Mills Nature Preserve, Pennsylvania, USA. August.

Doug Wechsler / Flatheaded mayfly (Maccaffertium sp.) nymph, portrait on white background, Pennsylvania, USA. April.

Doug Wechsler / Masked bee (Hylaeus sp.) female, concentrating a bubble of nectar, Pennsylvania, USA. August.

Doug Wechsler / March fly (Bibionidae) larvae, Pennsylvania, USA. April.

Doug Wechsler / March fly (Bibionidae) larva, portrait, Pennsylvania, USA. April.

Doug Wechsler / Long-tailed giant ichneumonid wasp (Megarhyssa macrurus) female ovipositing, the translucent membrane helping to push the threadlike ovipositor deep into the wood of a dead tree, Camp Woods Preserve,...

Doug Wechsler / Long-tailed giant ichneumonid wasp (Megarhyssa macrurus) female laying eggs in trunk of dead tree, Camp Woods Preserve, Pennsylvania, USA. September.

Doug Wechsler / Long-tailed giant ichneumonid wasp (Megarhyssa macrurus) female laying eggs in trunk of dead tree, Camp Woods Preserve, Pennsylvania, USA. September.

Doug Wechsler / Long-tailed giant ichneumonid wasp (Megarhyssa macrurus) male, resting on tree trunk, Camp Woods Preserve, Pennsylvania, USA. July.

Doug Wechsler / Long-tailed giant ichneumonid wasp (Megarhyssa macrurus) female ovipositing, showing the translucent membrane used to push the threadlike ovipositor deep into the wood of a dead tree, Camp Woods Prese...

Doug Wechsler / Long-tailed giant ichneumonid wasp (Megarhyssa macrurus) female ovipositing, the translucent membrane helping to push the threadlike ovipositor deep into the wood of a dead tree, Camp Woods Preserve,...

Doug Wechsler / Long-horned yellowjacket fly (Sphecomyia vittata), Batesian mimic of Yellowjacket, resting on leaf, Pennsylvania, USA. May.

Doug Wechsler / Group of Lined flat-barked beetles (Placonotus sp.) beneath bark of a log, Camp Woods Preserve, Pennsylvania, USA. December.

Doug Wechsler / Leopard slugs (LImax maximus) pair during courtship, Pennsylvania, USA. September.

Doug Wechsler / Leaf-footed bugs (Acanthocephala terminalis) pair mating on a leaf, Pennsylvania, USA. June.

Doug Wechsler / Leaf walker (Chalcosyrphus cruvarious), a syrphid fly, resting on a leaf, Camp Woods Preserve, Pennsylvania, USA. May.

Doug Wechsler / Keeled treehopper (Entylia carinata) with eggs and a tiny Chalcid wasp (Trichogramma sp.) with purple wings, a parasitoid on the eggs of the Treehopper, Pennsylvania, USA. August.

Doug Wechsler / Digger wasp (Sphex nudus) digging a burrow in soil, Evansburg State Park, Pennsylvania, USA. August.

Doug Wechsler / Brown-legged grass-carrying wasp (Isodontia auripes) nectaring on Mountain mint (Pycnanthemum sp.) flower, Pennsylvania, USA. August.

Doug Wechsler / Digger wasp (Sphex nudus) nectaring on Mountain mint (Pycnanthemum sp.) flower, Pennsylvania, USA. August.

Doug Wechsler / Juniper-apple rust (Gymnosporangium juniperi-virginianae) on Virginian juniper (Juniperus virginiana) tree, Morris Arboretum, Pennsylvania, USA. May.

Doug Wechsler / Springtail (Hypogastrura) crawling over a rotten log, Pennsylvania, USA. March.

Doug Wechsler / Narrow-headed marsh fly (Helophilus fasciatus) nectaring on Aster (Aster sp.) flower, Pennsylvania, USA. October.

Doug Wechsler / Horse guard wasp (Stictia carolina) digging burrow in sand, Pinelands National Reserve, New Jersey, USA. August.

Doug Wechsler / Horse guard wasp (Stictia carolina) in flight, Pinelands National Reserve, New Jersey, USA. August.

Doug Wechsler / Horse guard wasp (Stictia carolina) digging burrow in sand, Pinelands National Reserve, New Jersey, USA. August.

Doug Wechsler / Horse guard wasp (Stictia carolina) portrait, Pinelands National Reserve, New Jersey, USA. August.