Frankfurt Zoo is showing off its first lion cubs in 15 years.

The cubs' mother, Zarina, gave birth to triplets on April 14, and kept a close eye on her offspring as they took their first steps in the zoo's lion enclosure on Wednesday.

The father, 12-year-old Kumar, is being kept apart from six-year-old Zarina and the cubs until zookeepers are sure that the mother will tolerate his presence.

The Asian lion cubs have not yet been named, and keepers believe - but are not yet sure - that two of them are male.