Exotic Small Pets Worth Knowing About: Chinchillas, Degus, and Rats

Chinchillas are native to the Andes mountains and their biology reflects that origin. They thrive in cooler, dry environments — temperatures above 75°F can cause dangerous heat stress, so air-conditioned rooms are often a necessity in warmer climates. Their extraordinarily dense fur, which helps them survive cold mountain air, also means they cannot get wet in the traditional sense. Instead, they clean themselves by rolling in fine pumice dust, a behavior that must be accommodated with regular dust baths a few times per week.

Diet-wise, chinchillas do best on high-quality grass hay (timothy is a common choice), a small amount of plain pellets, and very limited treats. Sugary or fatty foods — even fruit — can cause digestive upset. Their digestive systems are sensitive, and sudden dietary changes should be avoided. For a fuller breakdown of what these animals need nutritionally, see small pet nutrition by species.

Chinchillas are also nocturnal or crepuscular, meaning they're most active at dawn and dusk. They can become tame and enjoy human interaction, but they're generally not lap animals — patience and gentle handling from an early age matters.

Degus look like a cross between a rat and a squirrel, and they're frequently overlooked in pet stores — which is a shame, because they're among the most cognitively engaging small rodents available. Originally from Chile, degus are highly social animals that form tight-knit groups in the wild. Keeping a single degu is widely considered poor practice; they do best in same-sex pairs or small groups, where they groom each other, communicate with a range of vocalizations, and generally thrive.

One of the most important things to know about degus: they are extremely sensitive to sugar. Unlike many rodents, degus appear prone to developing diabetes-like conditions when fed sugary foods. This means commercial hamster mixes or treats containing fruit, seeds high in fat, or molasses-based pellets are unsuitable. Plain hay, degu-specific pellets, and leafy greens are the foundation of a healthy degu diet.

Degus are diurnal — active during the day — which makes them more observable and interactive than nocturnal alternatives like chinchillas or hamsters. They enjoy puzzle feeders, wheels (solid-surface, not wire), and multi-level enclosures that give them room to climb and explore.

Domesticated rats (Rattus norvegicus, not wild rats) have a reputation that often works against them unfairly. In reality, they're considered by many exotic animal vets and animal behaviorists to be among the most intelligent, social, and trainable small pets available. Rats can learn their names, come when called, navigate mazes, and form strong bonds with their human caregivers — sometimes described as dog-like in their loyalty and engagement.

Like degus, rats should not be housed alone. They are social animals that groom each other, play together, and show signs of emotional distress when isolated. Same-sex pairs or groups are the standard recommendation. Females tend to be more active and exploratory; males are often calmer and more inclined to cuddle, though individual personalities vary widely.

Rats are omnivores with broad dietary needs. A high-quality rat-specific block or lab block diet, supplemented with fresh vegetables and occasional protein sources, generally supports good health. Avoid foods high in fat, salt, or sugar. One practical note: rats have a relatively short lifespan of two to three years on average, and they are prone to respiratory infections and tumors, especially as they age. Establishing care with a vet experienced in exotic or small animals early on is genuinely important — not just a precaution. You can compare how rats differ from other common rodents in our hamster vs. gerbil comparison.