Reece and Daniel go swimming with sharks and search for aquatic parasites in Scarborough. The race is on for Ayan and Ryan to help homeless greyhounds in Surrey. Also, Dick nets himself a job helping herring gulls.

Katie and Katherine get to work at the largest nesting swan colony in the UK. Chloe and Kieran care for Mona, the dog with no owner, at a dogs' home in Glasgow. Also, Dick and Dom beaver away with giant rodents that were nearly hunted to extinction over four hundred years ago.

Claire and Matthew become vet assistants for the day in Dunfermline, as a horse needs help, and Holly the dog has surgery. Ewan and Ethan eye up an owl with a sore head in Norfolk. And Dom is in at the deep end when he's asked to clean a giant shark tank.