This unseasonably mild winter has caused the in Moscow Zoo bears to wake up earlier than usual, the city’s mayor’s office said Wednesday.

Last year, the two Himalayan bears and one Kamchatka brown bear began coming out of hibernation in April.

“Our zoologists were preparing for the bears to wake up earlier due to the abnormally warm winter,” said Moscow Zoo’s CEO Svetlana Akulova in a statement.

She said Roza, the 28-year-old brown bear, and Alladin and Budur, the 25 and 26-year-old Himalayan bears, will start coming out of their pens at the “Island of the Bears” enclosure Friday.