Tigers can use their ears to communicate.

A tigress uses the white spots on the back of her ears to communicate with her cubs. They act as a flasher to the cubs, when a tigress senses danger she flattens her ears and the cubs respond by crouching down and hiding.

One meal a week.

For tigers only one in ten hunts are successful; a large deer can provide a tiger with one week's food.

Tigers have been around for over 2 million years. 

While tigers have been around longer than humans, the impacts of human development have caused their population to decline by 97% since the start of the last century.

[Source: https://tigers.panda.org/news_and_stories/stories/wwfs_top_10_facts_about_tigers/]