Help marine biologists understand the source of shark attacks that are frightening Australian beachgoers! This guided-inquiry activity exposes students to the fundamental principles of DNA fingerprinting, which is routinely used to identify individuals based on their genetic makeup. DNA fingerprinting has a broad range of human applications, including forensics and paternity testing, but it is also an important tool in ecology. Students will determine if a single shark has attacked multiple times or if there are several different attackers.