The Red-backed Salamander mostly lives on land, mainly on the forest floors of eastern North America. It has a bright red or orange stripe on its body that helps it blend in with the leaf litter. Another morph called Lead Salamanders shows no red pigmentations. Both have speckled undersides.

Interestingly, it is a part of the Plethodontidae family, which comprises lungless salamanders. Their respiration method is breathing through their skin and mouth. 

These terrestrial salamanders primarily feed on insects such as centipedes, spiders, and snails.

The Northern Slimy Salamander is also known as the Viscid Salamander, Grey-spotted Salamander, or Sticky Salamander. It lives in the leaf-strewn forests in the Northeastern United States. It has a long, slim body with dark hues and silver or white specks on its skin. 

This lungless salamander primarily feeds on ants and beetles. Since it is a terrestrial species, it skips the aquatic larval stage of development. It prefers to live alone and only interacts during the mating season. 

Northern slimy salamanders secrete adhesive-bound substances, impeding attackers' movement and biting capacity. They also respond to threats with body flips, tail lashes, and vocalizations.

The Southern Slimy Salamander lives in the southeastern United States, from southern South Carolina to central Florida. The salamander is named after Arnold B. Grobmani, a zoologist who studied these creatures.

It is black or brown, covered with white or silver spots, and feeds primarily on small invertebrates. Similar to its northern cousins, its unique defense mechanism involves secreting a sticky substance when threatened.

The Eastern Newt, living in eastern North America, inhabits small lakes, ponds, streams, and adjoining wet forests. It is also called the Red-spotted Newt.

It has a unique three-stage life cycle; it begins as aquatic larvae, transforms into land-dwelling juveniles known as 'efts,' and eventually returns to the water as mature adults. During the eft stage, their skin turns bright orange-red, which warns predators about the toxic chemicals in their skin. 

The eastern newt secretes tetrodotoxin, providing a chemical defense against predatory fishes and invertebrates. However, bullfrogs are unaffected by the toxin and readily consume the creature. Therefore, newts still sustain high predation levels2 in fish-containing habitats due to bullfrogs.

The Red Salamander lives in the slow-moving waters, tranquil springs, swamps, and damp woodland terrains of the eastern United States. 

These lungless salamanders, varying in color from bright red to orange-brown, darken and lose their distinct patterns with age. Unlike mud salamanders, they have more and larger dorsal spots, a gold-tinted iris with a horizontal bar, and a more pointed snout.

Fire Salamanders have black skin and bright yellow or orange markings, which deter predators. They live in the forests of Central and Southern Europe, where they spend their days hiding in logs, rocks, or burrows. 

Its main toxin, samandarin, triggers severe muscle convulsions, hypertension, and hyperventilation in vertebrates. Further analysis of its skin secretions revealed another alkaloid called samandarone5.

The Alpine Salamander lives in the European Alps and is distinguishable by its jet-black body. It has adapted to the region's rugged peaks and lush forests, with altitudes ranging from 2,300 to 6,600 feet. 

Interestingly, Alpine salamanders follow the viviparous reproductive method6, which allows them to give birth to live young. This is a trait uncommon in other amphibians.

The Northern Dusky Salamander, a resident of eastern North America from New Brunswick to South Carolina, adapts its living environments depending on its geographic location. 

In the north, it thrives in rocky woodland streams, seepage, and springs, while in the south, it gravitates toward upland stream sloughs, floodplains, and muddy areas. 

The lungless salamander sports an upper body hue shifting from reddish-brown to gray or olive and a white or gray underside sprinkled with dark spots. Variously colored stripes embellish its body and tail. 

Its diet depends on what's available, reflecting its nature as a feeding generalist. Despite being prone to predation, its ability for tail autonomy offers some level of protection, compensating for its lack of chemical defense mechanisms.

The Holbrook's Southern Dusky Salamander is endemic to the southeastern United States. Thriving in swampy areas with tannic waters near ponds, streams, or river flood plains, these creatures follow a largely nocturnal lifestyle. 

These lungless salamanders have stout bodies, relatively larger back legs, and a row of white spots lining each side of their bodies. Their color varies, ranging from dark brown to black, often accompanied by white-flecked undersides and lighter patches running down their backs. 

Since they look so similar to Northern and Spotted Duskies, you can only tell them apart by where they live.

The Southern Torrent Salamander, being a native of the Pacific Northwest, lives in high-oxygen, slow-flowing aquatic environments like mountain brooks and seeps for survival. With the lowest desiccation tolerance among North American salamanders, it struggles with extreme temperatures and low moisture levels.

Adorned with brown shades and darker spots on the dorsal side, it presents a slightly yellowish hue on the ventral side. Metallic flecks further highlight its forward-facing, large, dark eyes.

Amphipods and springtails make up their main diet. This pattern is consistent throughout their life stages, including the larval stage. On the other hand, natural threats to Southern Torrent Salamanders include the Pacific giant salamanders, garter snakes, and salmonid fishes.