Chester Zoo hails birth of 'one of world's rarest animals'

Chester Zoo has celebrated the birth of what it said was one of the rarest animals on earth.

The Cheshire attraction said the Persian onager was born to mum Azita after a year-long pregnancy.

Onagers hail from the semi-desert regions of Iran, and are related to domestic donkeys.

The foal was named Jasper, whose Persian meaning relates to treasure.