Photos and VideosMore Photos and Videos
Courtesy of San Diego Zoo
The one-month-old Sumatran tiger cubs in their den are both male. They were born March 5 in the San Diego Zoo Safari Park.
The San Diego Zoo Safari Park got a nice birthday present for its "over the hill" celebration Friday.
The park's 40th anniversary began with a ceremony to kick off a whole weekend of activities, where it was announced that the park received a $9 million pledge.
The pledge will fund a new home for the park's Sumatran tigers.
Two male Sumatran tiger cubs were born March 5 at the San Diego Zoo Safari Park, marking the 24th and 25th birth of the species.
The Safari Park opened to the public back in May 1972. Since then, it has contributed to the preservation of critically endangered species.
Park guests are welcome to take part in the celebration all weekend.