Where are those pesky piranhas?

They were going on a treasure hunt - but they weren't scared. Olivia Whyte, seven, Napier, Rebecca Campbell, seven, Hastings, Ester Belikoff, and Zohara Scott, eight, Palmerston North, ventured out in the National Aquarium of New Zealand on Napier's Marine Parade to solve the riddles and puzzles at Sunday night's "Piranhas in Pyjamas" sleepover.