The Amur tiger cubs at the Pittsburgh Zoo and PPG Aquarium are celebrating their first birthday today.

Mara now weighs 160 pounds while her brother, Petya, is 180 pounds.

Their birthday cakes were made from boxes filled with their favorite treats.

Amur tigers are an endangered species.

Mara and Petya were just about 14 pounds during their big media debut on October 3, 2006.

According to the Pittsburgh Zoo’s website, female tigers can weigh as much as 350-pounds – while males can tip the scales at 675-pounds!

Watch the tiger cubs live