This is because:
* Hunting: They are ambush predators and prefer to hunt when prey is less vigilant.
* Heat: They are better adapted to hunting in cooler temperatures, so they avoid the hottest parts of the day.
* Competition: Other predators, like leopards and dholes, are more active during the day, so tigers minimize competition by hunting at night.
However, Bengal tigers are not strictly nocturnal. They can be seen active during the day, especially if:
* They are hungry: They may need to hunt if they have missed a kill or if food is scarce.
* They are caring for cubs: They may need to teach their cubs how to hunt or protect them during the day.
* They are seeking shade: They may be more active in the day if there is good shade available.
Ultimately, Bengal tiger activity varies based on individual needs, prey availability, and environmental conditions.