Tarantulas primarily use their fangs to catch and subdue prey, and only rarely in response to threats. Tarantulas do not build a web to trap prey. Also, they do not have good eyesight. They hunt at night, detecting their prey by touch. They may use a web, created by structures at the end of the abdomen called "spinnerets", to act as a "trip wire" to alert them to the presence of prey. Since they cannot consume their prey whole, they must first liquefy the insides of their victims with a caustic mix of digestive enzymes. Bands of contracting muscles surround the tarantula's stomach and generate a powerful sucking motion. The tarantula's narrow mouth opening then acts like a straw for the solution to be sucked into the digestive tract. A fully mature Rose Hair can reach approximately 5 inches (12.5 cm) with legs extended. They have a brown body, but the cephalothorax is colored a slight metallic pink, giving them their name. One way they protect themselves is by flicking abdominal hairs at the attacker. These hairs can irritate the skin, eyes and nose.