American toad (Anaxyrus americanus). Stroud Preserve, Chester County, PA.
American toad (Anaxyrus americanus). Swarthmore, Pennsylvania.
American toad (Anaxyrus americanus). Binky Lee Preserve, Chester Springs, PA.
Western dusky slug (Arion subfuscus) feeding near patch of alcoholic flux. Mohonk Mountain House, New Paltz, NY.
Western dusky slug (Arion subfuscus) grazing on a burnt-orange bolete (Tylopilus ballouii). Rose Tree Park, Media, PA.
Western dusky slug (Arion subfuscus) grazing on stinging nettle (Urtica dioica). Crum Woods, Swarthmore, PA.
Common pill woodlouse (Armadillidium vulgare) with yellow spots. Mohonk Mountain House.
Wandering broadhead planarian (Bipalium adventitium) on mullein leaf. Swarthmore, PA.
Wandering broadhead planarian (Bipalium adventitium). Swarthmore, PA.
Three-lined land planarium (Bipalium pennsylvanicum). Hildacy Preserve, Media, PA.
Three-lined land planarium (Bipalium pennsylvanicum). Hildacy Preserve, Media, PA.
Spines from Galapagos slate pencil urchin (Eucidaris galapagensis) on beach. Isla Fernandina, Galapagos.
Group of Gammarus fasciatus deposited on streambank by flooding. Hildacy Preserve, Media, PA.
Sally Lightfoot crab (Grapsus grapsus) eating another Sally Lightfoot crab. Fernandina Island, Galápagos Islands.
Sally Lightfoot crab (Grapsus grapsus). Fernandina Island, Galápagos Islands.
Sally Lightfoot crab (Grapsus grapsus). Isla Santa Cruz, Galápagos.
Sally Lightfoot crab (Grapsus grapsus). Fernandina Island, Galápagos Islands.
Either a Cope’s gray treefrog (Hyla chrysoscelis) or eastern gray treefrog (Hyla versicolor). Need chromosome count or call to distinguish. Cape May Point, PA.
Diamond stingray (Hypanus dipterurus). Off San Cristobal, Galapagos.
Galápagos humpback scorpionfish (Idiastion hageyi) on beach. Isla Rabida, Galápagos.
Brown sea cucumber (Isostichopus fuscus) with red cardinal fish. Off Isla Genovesa, Galápagos.
Harvestman (Leiobunum sp.) molting. Mohonk Mountain House, New Paltz, NY.
Harvestman (Leiobunum sp.) molting. Mohonk Mountain House, New Paltz, NY.
Green frog (Lithobates clamitans) on bank of small pond. Mohonk Mountain House, New Paltz, NY.
American bullfrog (Lithobates catesbeianus). Mohonk Mountain House, New Paltz, NY.
American bullfrog (Lithobates catesbeianus) waiting for dinner in Chinatown. Philadelphia, PA.
Wood frog (Lithobates sylvaticus). Formerly Rana sylvatica. Hildacy Farm Preserve, Media, Pennsylvania.
Wood frog (Lithobates sylvaticus) eggs. Hildacy Preserve, Media, PA.
Common earthworms (Lumbricus terrestris) mating. Swarthmore, PA.
Changeable mantlesglug (Megapallifera mutabilis) on lichen. Mohonk Mountain House, New Paltz, NY.
Changeable mantleslug (Megapallifera mutabilis) eating lichen .
Slender phlox (Microsteris gracilis) growing inside mountain lion paw print. Crooked River National Grassland, Madras, OR.
Slender phlox (Microsteris gracilis) growing inside mountain lion paw print. Crooked River National Grassland, Madras, OR.
American giant millipede (Narceus americanus complex). Kaaterskill Falls, Hunter, NY.
Red-spotted newt (Notophthalmus viridescens viridescens). Mohonk Mountain House, New Paltz, NY.
Newly-molted harvestman (Opiliones). Mt. Cuba Center, Delaware.
Cuban tree frog (Osteopilus septentrionalis). Zolfo Springs, FL.
Juvenile Cuban tree frog (Osteopilus septentrionalis) on lemongrass. Zolfo Springs, FL.
Juvenile Cuban tree frog (Osteopilus septentrionalis). Zolfo Springs, FL.
American bullfrog (Lithobates catesbeianus). Clayton Park, Monmouth County, NJ.
American bullfrog (Lithobates catesbeianus). Clayton Park, Monmouth County, NJ.
Panamic cushion star (Pentaceraster cumingi). Great Darwin Bay, San Cristobal, Galapagos.
Panamic cushion stars (Pentaceraster cumingi). Great Darwin Bay, Isla Genovesa, Galápagos.
Blue seastar (Phataria unifascialis). Great Darwin Bay, Isla Genovesa, Galápagos.
Eastern red-backed salamander (Plethodon cinereus). Unionville Serpentine Barren, Unionville, PA.
Eastern red-backed salamander (Plethodon cinereus). Wayne County, PA.
Eggs of island applesnail (Pomacea maculata). Myakka River State Park, Sarasota, FL.
Eggs of island applesnail (Pomacea maculata). Myakka River State Park, Sarasota, FL.
Eggs of island applesnail (Pomacea maculata). Myakka River State Park, Sarasota, FL.
White river crayfish (Procambarus acutus) swimming through duckweed (Lemna spp.). John Heinz National Wildlife Sanctuary, Tinicum, PA.
Giant toad (Rhinella horribilis). La Selva, Costa Rica.
Close-up of coral (Scleractinia) on beach. Darwin Bay Genovesa Island, Galápagos.
Tiktaalik roseae. Academy of Natural Sciences of Philadelphia.
Fossilized “fishapod” (Tiktaalik roseae). Academy of Natural Sciences of Philadelphia, Philadelphia, PA.
Tiktaalik roseae at the Academy of Natural Sciences of Philadelphia. Shown along with Nature issue with cover story on the beastie.
Fossilized “fishapod” (Tiktaalik roseae). Academy of Natural Sciences of Philadelphia, Philadelphia, PA.
Vietnamese centipede (Scolopendra subspinipes). Kailua-Kona, Hawai’i.