A couple of baby tiger cubs made their debut at the Pittsburgh Zoo, Tuesday.

The rare, endangered Amur tiger cubs - a male and female - are 9 weeks old. They are being hand raised at the zoo because their mom Terney neglected them from birth.

Without human intervention in the first weeks, they would not have survived. But zoo staffers said they are doing great - and growing quickly.

And these baby cubs are eating with gusto - they get three bottles a day and meat twice a day.

Amur tigers - often referred to as Siberian tigers - are native to Russia and the largest of all the cat species. Males can get up to 600 pounds and females around 300 pounds.

They will eventually be moved out of the animal care center and introduced to other tigers.