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"Degus are highly social. They live in burrows, and, by digging communally, they are able to construct larger and more elaborate burrows than they could on their own.[3] Degus digging together coordinate their activities, forming digging chains.[4] Females living in the same group have been shown to spontaneously nest communally;[5][6] they nurse one another's young. They spend a large amount of time on the surface, where they forage for food.[4] When foraging, their ability to detect predators is increased in larger groups,[7] and each animal needs to spend less time in vigilance. Degus exhibit a wide array of communication techniques. They have an elaborate vocal repertoire comprising up to 15 unique sounds,[8] and the young need to be able to hear their mother's calls if the emotional systems in their brains are to develop properly.[9] They use their urine to scent mark,[10] and experiments have shown that they react to one another's marks,[11] although in males the hormone testosterone may suppress their sense of smell somewhat.[12]
Degus are seasonal breeders; the breeding season for wild degus begins in the Chilean autumn when there is roughly 12 hours light:12 hours darkness,[13] with pups born in early to mid spring.[14] Female degus are pregnant for approximately ninety days,[2][15] having a comparatively long gestation period compared to other non-caviomorph rodents. Female pregnant weight varies over the course of gestation and according to litter size;[16] litters contain an average of six pups,[5] but size can range from one or two up to twelve young.[16] Degu pups are born relatively precocial, fully furred and with eyes open, and their auditory and visual systems are functional at birth.[17]
Unlike some other octodontids, degus are diurnal[18] (active during the day), and they have good vision. Their retinas include rod cells and two types of cone cells, corresponding to peak sensitivity in the green and ultraviolet regions of the spectrum.[19] Behavioral experiments have shown that degus are able to discriminate ultraviolet light from the wavelengths visible to humans; it is likely that this ultraviolet sensitivity has a social function, since both their ventral (stomach) fur and their urine are highly UV reflective.[20]"

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