Most species are active during the day and are terrestrial, although the marsh mongoose and a few others are. Some mongooses live alone or in pairs, but others, such as the banded mongoose, dwarf mongooses, live in large groups. Litters usually consist of two to four young. Some species, mainly the mongoose but also the Indian gray mongoose,
were introduced to numerous islands, (off the coast of East Africa),
Mauritius, numerous islands in the Adriatic Sea off the coast of
Croatia, Hawaii, and the Fiji islands. Originally intended to help
control rodents and snakes, these introductions were disastrous, because
the mongooses severely depleted the populations of native fauna.
Because of their potential destructiveness, importation of all mongooses
into the United States is strictly regulated.
Source: https://www.youtube.com/watch?v=v3hmroN6zc4
