Teams from a zoo scouring a stretch of riverbank for a runaway capybara say it is vital she is reunited with her sister.

The week-long search to track down and catch Samba started last Tuesday after she escaped with Tango from a temporary holding area at Marwell Zoo, near Winchester, a day after arriving from Suffolk.

Tango was found nearby but her nine-month old sibling has roamed about 2 miles (3.5km) from the zoo and was last seen on Sunday by a dog walker near Twyford.

Laura Read, the zoo’s boss, said Tango was “fine and being checked on regularly… but they do need to be back together. They are social animals and live in groups, so it’s really important we reunite them.”