A photograph of the only known instance of interspecies combat in male glassfrogs, photographed in Southern Ecuador. A red spotted glassfrog (Nymphargus grandisonae) grasps an Emerald glass frog (Espadarana prosoblepon) in a headlock. The males of certain species of glassfrog engage in this territorial wrestling behavior yet its typically limited to males of their own species.

A male marine iguana (Amblyrhynchus cristatus) on a lava beach in the Galapagos Islands National Park, Ecuador.

A pair of male marine iguanas (Amblyrhynchus cristatus) bashing their heads together in a territorial dispute in the Galapagos. Neither was willing to back down and both were bruised and bloodied.

After eating a highly toxic newt a California red sided garter snake (Thamnophis sirtalis infernalis) is somewhat sluggish and takes a few min to push the newt down further as well as clear debris that is stuck in its mouth.

A juvenile smooth fronted caiman (Paleosuchus trigonatus) near a small jungle stream in Amazonian Peru.

Potamites strangulatus, a semi aquatic lizard species that can be found in small flowing rivers in jungle settings.

A orange bellied water snake (Nerodia erythrogaster) coiled on a tire in its polluted wetland home. Honorable mention in the Human Impact category of California Academies BigPicture Contest.

A wild bobcat (Lynx rufus) in the late evening in the Marin headlands.

Yellow pitcher plants (Sarracenia flava) growing in a North Carolina bog. These plants attract insects to their 'pitchers' where glands secrete sap with narcotic properties. Drugged insects fall into the plant and drown in the water at the bottom of the pitcher, the plant is able to supplement its nutrition this way.

The White faced nunbird (Hapaloptila castanea) a rare inhabitant of the South American cloudforest. It is elusive and more often heard than seen.

A male glass frog (Hyalinobatrachium pellucidum) guards his eggs on a leaf in the Ecuadorian rainforest.

Melyroidea magnifica, a rarely seen species of cockroach from the Amazon. It lives in social groups inside trees and bamboo and periodically emerges to forage. Its diurnal activity and bright coloration suggest toxicity, mimicry or both.

A glassfrog (Hyalinobatrachium pellucidum) guards his eggs. Parental care is found in about 10% of frogs, and few are as devoted as species in this genus. The male remains with the eggs until they hatch guarding them from predators and parasites as well as keeping them hydrated. Although he won't leave the eggs, he continues to call in hopes of attracting another female frog.

The Amazon wood lizard (Enyalioides laticeps) relies on its excellent camouflage to stay hidden in the verdant rainforest. Active during the day, they may sit motionless keeping an eye on their surroundings until they spot a tasty bug.

A fishing spider has seized a pair of peters dwarf frogs (Engystomops petersi) that were in amplexus and getting ready to deposit eggs. The spider has the female yet the male remains holding on to her.

The Amazon Basin emerald tree boa (Corallus batesii) lives in rainforest canopy in the Amazon rainforest. It is rarely encountered as it seldom ventures to ground level.

Mountain Frog

A marbled four eyed frog (Pleurodema marmoratum), one of the two highest dwelling frog species in the world. It lives up to 5400 m asl in the Andes of Southern Peru.

The warty toad (Rhinella spinulosa) is the amphibian with the widest elevational range in the world, found from sea level to about 5200 m asl. At the high points of its range, there are no people and little light pollution or atmosphere to obscure the stars. The Inca people named a constellation Hanp'atu after this toad.

The marbled water frog (Telmatobius marmoratus) is one of the two highest elevation frogs in the world, both of which occur in the Cordillera Vilcanota. A threatened species declining from harvesting by humans, destruction of their habitat, introduction of invasive trout, and the chytrid disease.