S1, E6: Jen has a collection of animal calls but doesn't know which animals they are. Andy can help! An elephant, a howler monkey, and then a mysterious one that sounds like a wolf but is most unusual. While they're wondering, Andy shows Jen the cactus he's got Mr Hammond for his birthday. It's from the Sonoran Desert in the USA and is really rare. Jen puts it somewhere safe while Andy takes a call from Mr Hammond, but then Andy sits on it! Ouch! The cactus is ruined. Andy rushes on an adventure to the Sonoran Desert, to get a new one for Mr Hammond before his birthday party. The desert is amazing and Andy meets some creatures along the way, including a grasshopper mouse family - he's always wanted to see them. The mice have been spotted by Harris's Hawks when Andy hears that same wolf like call again that he heard with Jen at the Safari World and is amazed at which tiny creature is making such an enormous call...