Cooper’s hawk (Accipiter cooperii) eating a bird. Swarthmore, PA.
Eastern gray squirrel approaching a Cooper’s hawk (Accipiter cooperii). Swarthmore, PA.
White-cheeked pintail (Anas bahamensis galapagensis). El Chato Tortoise Reserve near Los Gemelos, Isla Santa Cruz, Galápagos.
Anas platyrhynchos (mallard) female with ducklings. Kentucky Horse Park, Lexington, KY.
Anhinga anhinga drying wings
Galapagos great blue heron (Ardea herodias cognata). Isla Santa Cruz, Galapagos Islands, Ecuador.
Great blue heron (Ardea herodias). Lexington, Kentucky.
Canada geese (Branta canadensis). Baylands Nature Preserve, East Palo Alto, CA.
Buteo jamaicensis (red-tailed hawk) with squirrel. Swarthmore, PA.
Red-shouldered hawk (Buteo lineatus). Zolfo Springs, FL.
Northern cardinal (Cardinalis cardinalis) during blizzard. Swarthmore, PA.
Gray-cheeked thrush (Catharus minimus). Swarthmore, PA.
Pair of courting swallow-tailed gull (Creagrus furcatus). Genovesa, Galápagos.
Swallow-tailed gulls (Creagrus furcatus) courting. Tower Island, Galápagos.
Pair of swallow-tailed gulls (Creagrus furcatus) under Opuntia. Isla Genovesa, Galápagos.
Steller’s jay (Cyanocitta stelleri). Yosemite National Park, CA.
Flightless Galapagos cormorant (Phalacrocorax harrisi) drying its feathers near a mess of marine iguanas. Isla Fernandina, Galapagos.
Magnificent frigatebirds (Fregata magnificens) in flight. Near Isla Santiago in the Galápagos.
Flock of great frigatebirds (Fregata minor). Genovesa, Galápagos Islands.
Great frigatebird (Fregata minor) showing green tinge on wings. Isla Genovesa, Galápagos.
Great frigatebird (Fregata minor) sleeping. Isla Genovesa, Galapagos.
Great frigatebird (Fregata minor) with inflated gular sac. Genovesa, Galápagos Islands.
Great frigatebird (Fregata minor) in tree. Isla Genovesa, Galápagos.
Small ground-finch (Geospiza fuliginosa) in a tree. Isla Isabela, Galápagos.
Small ground finch (Geospiza fuliginosa) in tree. Isla Isabela, Galapagos.
Common cactus finch (Geospiza scandens) on Opuntia flower. Puerto Ayora, Isla Santa Cruz, Galápagos.
Common cactus finch (Geospiza scandens intermedia) foraging on giant prickly pear (Opuntia echios var. echios) on Isla Santa Cruz, Galápagos, Ecuador.
Great frigatebird (Fregata minor) with inflated gular pouch. Isla Genovesa, Galapagos.
Galapagos mockingbird (Mimus parvulus) on candelabra cactus. Puerto Ayora, Santa Cruz Island.
Fledgling Galápagos mockingbird (Mimus parvulus parvulus) in a tree. Charles Darwin Research Station, Puerto Ayora, Isla Santa Cruz, Galápagos, Ecuador.
Black-eared Galápagos mockingbird (Mimus parvulus personatus). Isla Santiago, Galápagos.
Black-eared Galápagos mockingbird (Mimus parvulus personatus) in a tree. Isla Santiago, Galápagos.
Montezuma oropendola (Psarocolius montezuma) nests hanging in tree. La Selva Research Station, Costa Rica.
Galapagos flycatcher (Myiarchus magnirostris) on dead tree. Cero Dragón, Galápagos Islands, Ecuador.
Galápagos flycatcher (Myiarchus magnirostris). Isla Santa Cruz, Galápagos Islands, Ecuador.
Galápagos flycatcher (Myiarchus magnirostris) attacking its reflection in a camera lens. Near Puerto Egas, Isla Santiago, Galápagos, Ecuador.
Galápagos flycatcher (Myiarchus magnirostris) on weathered lava. Isla Santiago (James Island), Galápagos, Ecuador.
Yellow-crowned night heron (Nyctanassa violacea pauper). Isla Genovesa, Galápagos.
Yellow-billed cardinal (Paroaria capitata). Kaloko-Honokohau National Historic Park, HI.
Yellow-billed cardinal (Paroaria capitata). Kekaha Kai State Park, Hawai’i.
A brown pelican (Pelecanus occidentalis urinator) making a wet landing near Fernandina Island, Galapagos.
Brown pelican (Pelecanus occidentalis) with Daphne Minor in background. Black Turtle Cove, Isla Santa Cruz, Galápagos, Ecuador.
Brown pelican (Pelecanus occidentalis) in flight. Galápagos, Ecuador.
Ventral view of a brown pelican (Pelecanus occidentalis urinator). Near Cabo Nepean, Isla Santiago, Galápagos, Ecuador.
Brown pelican (Pelecanus occidentalis urinator). Isla Santa Cruz, Galápagos.
Neotropic cormorant (Phalacrocorax brasilianus). Playa del Carmen, Mexico.
Galápagos cormorant (Phalacrocorax harrisi) in nest. Fernandina Island, Galápagos Islands.
Carolina chickadee (Poecile carolinensis) . Swarthmore, PA.
Female yellow warbler (Setophaga petechia aureola) in the highlands of Santa Cruz Island, Galápagos Archipelago. Sometimes called a mangrove warbler, and formerly classified as Dendroica petechia aureola. Ecuador.
Pair of Nazca boobies (Sula granti) in a field of flowering goat’s head. Genovesa Island, Galápagos.
Nazca boobies (Sula granti) courting in a field of goat’s head. Genovesa Island, Galápagos.
Nazca booby (Sula granti) with STOP sign. Isla Genovesa, Galápagos.
Nazca booby (Sula granti). Genovesa Island, Galápagos.
Galapagos blue-footed booby (Sula nebouxii ssp. excisa). Isla Genovesa.
Brown morph of a red-footed booby (Sula sula). Isla Genovesa, Galápagos.
Juvenile red-footed booby (Sula sula). Tower Island, Galápagos, Ecuador.
Red-footed booby near Opuntia. Genovesa, Galápagos Islands.
Red-footed booby (Sula sula) on a branch. Isla Genovesa, Galápagos.
Leucistic American robin (Turdus migratorius). Swarthmore, Pennsylvania.
Kingbird (Tyrannus sp.). Possibly T. melancholicus. Cozumel, Mexico.
Galápagos dove (Zenaida galapagoensis). Genovesa, Galápagos.
White-crowned sparrow (Zonotrichia leucophrys). Baylands Nature Preserve, East Palo Alto, CA.