Tigers generally sleep in large groups, and may rest at night in tall grasses on plains and lowlands, or huddle beneath fallen trees in inclement weather conditions. Tigers do not build conventional shelters like dens, nests and other dwellings as do birds, squirrels and other animals. Although they do not have homes in formal structures, tigers are territorial creatures, and rarely venture out of their native habitats.
While most animals rely on shelters and protection at night, tigers rely on cover for hunting during the day. Tigers are predatory animals, and seek the assistance of tall grasses and dense woodlands to keep them out of sight when stalking prey. Some tigers, such as Bengal tigers, make their homes in different types of forests, including evergreen, deciduous and semi-evergreen. These habitats contain critical water supplies and afford the dense vegetation that tigers need to stay camouflaged. Tigers are territorial and males can be quite aggressive; they defend their turfs using scent markings, and attack males perceived as threats. Tigers establish their own territories, but exhibit more social behaviors when raising young. Upon giving birth to litters, females congregate to help one another provide food and security for the young tigers, and maintain vigilant lookout positions around the clock.