Killing for a Living S01E09 - Killers of the Dark

Nocturnal creatures are having an arms race. Their weapons are not offensive or defensive, but an espionage equipment. Some use night vision and take full advantage of the moon and the stars in low light, while others use a fine-tuned smell and touch senses. There are animals whose ears are more sensitive than any microphone and the creatures who observe their surroundings with three-dimensional sonars or electro-magnetic sensors. Some even produce light: a trap that attracts their prey to death.