Here's why:
* Size: Monkeys are typically much smaller than a tiger's usual prey.
* Habitat: While Bengal tigers and some monkey species share overlapping ranges, their habitats aren't always the same. Monkeys often live in trees, while tigers prefer grasslands and forests.
* Accessibility: Monkeys are agile and can climb trees easily, making them difficult prey for a tiger.
While it's not impossible for a tiger to eat a monkey, it's not a regular occurrence.