In a bustling city, a vast zoo housed numerous animals. Two of the inhabitants were Mark, a lively and playful dog, and Crunch, a massive and scaly crocodile. Crunch lived in a substantial enclosure with a pond, where he enjoyed swimming and sunbathing. Meanwhile, Mark resided near the zookeeper, Sarah, who would bring him to the zoo daily. Mark would eagerly greet visitors and sometimes wander off on his adventures.