Jeff Rotman / Bat rays schooling, Galapagos Is (Myliobatis californica)

Doug Wechsler / Eastern tiger swallowtail (Papilio glaucus) and Spicebush Swallowtail (Papilio troilus) on butterfly weed, French Creek State Park, Berks County, Pennsylvania, USA, August.

LYNN M. STONE / Eastern Tiger Swallowtail butterfly (Papilio glaucus), male, feeding on nectar of Pink Thistle, Illinois, USA

LYNN M. STONE / Eastern Tiger Swallowtail butterfly (Papilio glaucus), dark phase female, on Pink Thistle in tallgrass prairie remnant, Illinois, USA (an intermediate phase between the typical yellow and the entirely...

Jerry Monkman / Eastern tiger swallowtail butterfly {Papilio glaucus} Sabins Pasture, Vermont, USA

Gerry Ellis / Tiger Swallowtail (Papilio glaucus) butterfly perching on pink flowers, North America

Rolf Nussbaumer / Eastern tiger swallowtail butterfly (Papilio glaucus) nectaring on Red buckeye (Aesculus pavia). Palmetto State Park, Texas, USA.

Doug Wechsler / Eastern tiger swallowtail (Papilio glaucus) and Peck's skipper butterfly (Polites peckius) on swamp milkweed (Asclepias incarnata) French Creek State Park, Pennsylvania, USA. July.