The Dendrobates auratus "Nicaraguan Green and Black" is a specific color morph of the green and black poison dart frog, originating from the rainforests of southeastern Nicaragua. It is one of the classic and well-known variations of the species in the amphibian hobby.  

Characteristics

Coloration: This morph typically features a vibrant, metallic green base color with extensive black reticulated (net-like) patterns or splotches across its body. The green can range from lime to mint or forest green.

Size: A medium-sized Dendrobates auratus morph, adults generally reach up to 1.5 inches (38 mm) or larger in length. Females are usually slightly larger and wider than males.

Behavior: They are diurnal (active during the day) and primarily terrestrial, spending much of their time foraging on the forest floor, though they are also capable climbers. In captivity, they are generally moderately shy but can become bolder over time. They can be kept in groups, provided the enclosure is spacious with plenty of hiding spots to mitigate potential female-to-female aggression.

Toxicity: In their native wild habitat, these frogs are toxic, acquiring defensive alkaloids from their diet of specific ants and insects. Captive-bred frogs, lacking this specific diet, are not poisonous.  

Habitat and Care (in Captivity)

Origin: Native to southeastern Nicaragua, on the Atlantic slope.

Terrarium: A tropical vivarium setup is required, featuring high humidity, abundant leaf litter, live plants, and numerous hiding spots. A general guideline is 1 square foot of space per frog.

Temperature: The ideal temperature range is 70–80°F (21–27°C) during the day, with a   slight drop at night. Prolonged exposure to temperatures outside this range can be fatal.

Humidity: High humidity levels, typically between 70-100% with peaks during misting, are necessary and can be maintained with misting systems or daily manual misting. 

Diet: They are insectivores and thrive on small, live, vitamin-dusted insects in captivity, such as flightless fruit flies (Drosophila melanogaster and D. hydei), springtails, and isopods.

Breeding: They are considered relatively easy to breed in captivity. Females lay small clutches of 4-10 eggs under leaf litter or in a coco hut. The male then guards the eggs and transports the resulting tadpoles to a small body of water. Tadpoles are cannibalistic if kept in the same small water source.