Doug Wechsler / American moon / Luna moth {Actias luna} Pennsylvania, USA

Doug Wechsler / Northern Paper Wasp {Polistes fuscatus} on Goldenrod {Solidago sp} gathering nectar and pollinating, Pennsylvania, USA

Doug Wechsler / Releasing Trout into river to stock for fishing, Wissahickon Creek, Philadelphia, Pennsylvania, USA

Doug Wechsler / Releasing Trout into river to stock for fishing, Wissahickon Creek, Philadelphia, Pennsylvania, USA

Doug Wechsler / Large Milkweed Bug {Oncopeltus fasciatus} on Goldenrod flowers, Pennsylvania, USA

Doug Wechsler / Locust Borer {Megacyllene robiniae} feeding on Goldenrod, Pennsylvania, USA

Doug Wechsler / Monarch butterflies {Danaus plexippus} mating, Pennsylvania, USA

Doug Wechsler / Fairy Shrimp {Eubranchipus sp} female with eggs visible inside her, vernal pool, Pennsylvania, USA

Doug Wechsler / Fairy Shrimp {Eubranchipus sp} female with eggs visible inside her, vernal pool, Pennsylvania, USA

Doug Wechsler / Wild Grape vine {Vitis sp} Pennsylvania, USA

Doug Wechsler / Black Swallowtail butterfly {Papilio polyxenes} resting on Goldenrod, Pennsylvania, USA

Doug Wechsler / Blow Fly {Lucilla sp} Pennsylvania, USA

Doug Wechsler / Round Goldenrod gall caused by larva of Goldenrod gall fly {Eurosta solidagnis} Pennsylvania, USA

Doug Wechsler / American moon / Luna moth {Actias luna} feeding on sweetgum leaf, Pennsylvania, USA

Doug Wechsler / Caterpillar larva of Tomato hornworm moth {Manduca quinquemaculata} with parasitic wasp cocoons. Pennsylvania, USA

John Cancalosi / Coal - "Peacock coal". Pennsylvania, USA.

Tom Vezo / Eastern Bluebird (Sialia sialis) at nest with food, Jessup, Pennsylvania

John Cancalosi / Eastern Cottontail {Sylvilagus floridanus} Pennsylvania, USA.

John Cancalosi / Eastern Cottontail rabbit {Sylvilagus floridanus} feeding, Pennsylvania, USA.

John Cancalosi / Northern Cardinal {Cardinalis cardinalis} male, Pennsylvania, USA

Niall Benvie / Katydid (Tettigonoidae) on thistle head, Pennsylvania, USA

Doug Wechsler / Red legged grasshopper (Melanoplus femurrubrum) on Goldenrod, Pennsylvania, USA

Doug Wechsler / Beech blight aphid (Grylloprociphilus / Fagiphagus imbricator) on Beech tree, woolly aphids, Pennsylvania, USA

Doug Wechsler / Chinese mantid (Tenodera aridifolia) recently emerged, Pennsylvania, USA

Doug Wechsler / Chinese mantid (Tenodera aridifolia) recently emerged, Pennsylvania, USA

Niall Benvie / Chinese mantid (Tenodera aridifolia) Pennsylvania, USA

Doug Wechsler / American toad {Bufo americanus} male calling, Pennsylvania, USA

Niall Benvie / Close up of American alligator eye (Alligator mississippiensis) Pennsylvania, USA

Doug Wechsler / Bullfrog female {Rana catesbeiana} Lafayette Hill, Pennsylvania, USA

Niall Benvie / Close up of American alligator face (Alligator mississippiensis) Pennsylvania, USA

Doug Wechsler / Spring Peeper treefrog singing (Hyla crucifer) Pennsylvania, USA

Doug Wechsler / Leopard frog on leaves {Rana pipiens} Presque Isle State Park, Pennsylvania, USA

Niall Benvie / Eastern american chipmunk {Tamias striatus}, feeding on black sunflower seeds, Pennsylvania, USA.

Doug Wechsler / Shelf fungus on rotting wood {Ganoderma tsugae} Rickett's Glen SP, Pennsylvania, USA

Doug Wechsler / Bullfrog tadpole, 1st autumn {Rana catesbeiana} Pennsylvania, USA

Doug Wechsler / Bullfrog tadpole {Rana catesbeiana} Pennsylvania, USA

Doug Wechsler / Boys standing below waterfall in glen, Rickett's Glen, Pennsylvania, USA

Doug Wechsler / Aerial view of forested watershed at Pine Creek Gorge, Central Pennsylvania, USA

Niall Benvie / Decaying barn building in Central Pennsylvania, USA

Niall Benvie / Broadleaved woodland with understorey vegetation in autumn, Central Pennysylvania, USA

Niall Benvie / Broadleaved woodland with understorey vegetation in autumn, Central Pennysylvania, USA

Doug Wechsler / Eastern Deciduous forest in autumn colours, Fairmount Park, Philadelphia, Pennsylvania, USA

Niall Benvie / Corn / Maize growing on farmland, Central Pennsylvania, USA

Tom Vezo / House wren {Troglodytes aedon} McClure, Pennsylvania, USA

Doug Wechsler / Bullfrog male in garden pond {Rana catesbeiana} Pennsylvania, USA

Doug Wechsler / Maple, Tulip tree and Birch tree trunks (right to left) in woodlands, Pennsylvania, USA

John Cancalosi / Hellbender {Cryptobranchus alleganiensis} Pennsylvania, USA

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} adults tending larvae, Pennsylvania, USA

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} with egg, larva, pupa and adult, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} with adult tending pupae, Pennsylvania, USA.

Doug Wechsler / Male Tiger swallowtail {Papilio glaucus} feeding on Buddleia flowers, Pennsylvania, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} with egg, larva, pupa + adult, USA.

Doug Wechsler / Blue winged wasp {Scolia dubia} feeding on Goldenrod, Pennsylvania, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} with eggs in cells, Pennsylvania, USA.

Doug Wechsler / Spotted touch me not {Impatiens capensis} Pennsylvania, USA.

Adam White / Purple martin (Progne subis) nest boxes, Pennsylvania USA

Niall Benvie / Cottonwood trees with early snow (Populus deldoides) Pennsylvania, USA.

Doug Wechsler / Woodchuck {Marmota monax} feeding on lawn, Pennsylvania, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} with larvae, Pennsylvania, USA.

Doug Wechsler / Carpenter bee {Xylocopa sp} feeding at butterfly bush, Pennsylvania, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} with larvae, Pennsylvania, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} adults tending larvae, Pennsylvania, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} adults tending larvae, Pennsylvania, USA.

Doug Wechsler / Eastern yellowjacket nest {Vespula maculifrons} with adults and larvae, Pennsylvania, USA

Doug Wechsler / Paulownia tree flowering {Paulownia tomentosa} Philadelphia, PA, USA.

Doug Wechsler / Paulownia tree flowering {Paulownia tomentosa} Philadelphia, PA, USA.

Mark Taylor / Meanders of San Juan River, Utah, USA, cut into strata of Pennsylvanian Hermosa Formation. (Late carboniferous period)

Doug Wechsler / Promethea moth caterpillar, Pennsylvania, USA

Doug Wechsler / Locust borer {Megacyllene robinae} feeds on goldenrod pollen. Pennsylvania, USA

Doug Wechsler / Deer tick biting human flesh {Ixodes scapularis} Pennsylvania, USA

Doug Wechsler / Hickory horned devil / Royal walnut moth pupa {Citheronia regalis} Pennsylvania, USA - chrysalis

Niall Benvie / Chinese mantid on flower, Pennsylvania, USA.

Michael & Patricia Fogden / Timber Rattlesnake (Crotalus horridus) coiled on ground among leaf litter, Appalachian Mountains, Pennsylvania

Michael & Patricia Fogden / Timber Rattlesnake (Crotalus horridus) venomous snake camouflaged in leaf-litter in the Appalachian Mountains, Pennsylvania

Michael & Patricia Fogden / Timber Rattlesnake (Crotalus horridus) newborn babies, Appalachian Mountains, Pennsylvania

Tom Vezo / Eastern Bluebird (Sialia sialis) at entrance to nest with food for young, Jessup, Pennsylvania

Tim Fitzharris / Western Blue Flag Iris (Iris missouriensis) close-up, Hickory Run, Pennsylvania

Gerry Ellis / Fall leaves on forest floor, eastern hardwood forest, Allegheny National Forest, Pennsylvania

Doug Wechsler / Spotted salamander during breeding season. PA, USA {Ambystoma maculatum}

John Cancalosi / Timber rattlesnake recently emerged from den {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake adults + young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake, four gravid females {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake adults + young {Crotalus horridus} emerging from winter den, USA

John Cancalosi / Timber rattlesnake adult + young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake recently emerged from den {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake adult + young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake adult + young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake adult + young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnake with young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnakes emerging from den under rock {Crotalus horridus}

John Cancalosi / Timber rattlesnakes with young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnakes emerging from den under rock {Crotalus horridus}

John Cancalosi / Timber rattlesnakes emerging from den under rock {Crotalus horridus}

John Cancalosi / Timber rattlesnakes with young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnakes with young {Crotalus horridus} Pennsylvania, USA

John Cancalosi / Timber rattlesnakes with young {Crotalus horridus} Pennsylvania, USA