The Toronto Zoo's twin giant panda cubs are brother and sister.

The zoo announced the genders of the cute little bears Friday, and released a new photo of the siblings.

In order to figure out the gender of the pandas, zoo staff had to collect stem cells which were then delivered to experts at Trent University for testing.

The pandas are four-months-old and Zoo officials says they're hoping to reveal the panda names on February 8, 2016.

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