Cats seem to love catnip and silvervine, but until recently science didn't know why.
When exposed to catnip or silver vine, cats lick and chew the leaves, and rub their faces against the plants.
Many felines even eat the plants and experience a type of euphoria lasting 5 to 15 minutes.
The effect these plants have on our feline friends has been known for centuries, but scientists didn’t fully understand the purpose.