"Puffer" refers to a type of fish, commonly known as a pufferfish or blowfish. It is characterized by its unique ability to inflate its body into a ball-like shape when threatened, making it appear larger and more intimidating to potential predators. The pufferfish has a spiky exterior and a distinctive face with large eyes and a small mouth. Its coloration can vary, but it often features patterns of spots or stripes. Despite its cute appearance, the pufferfish is highly poisonous, containing a toxin called tetrodotoxin that can be deadly to predators and even humans if consumed.