(a) Photograph of the underside of the fire chaser beetle M. acuminata showing one of the two infrared sensory pits (red circle and arrow) by which the beetle detects and is attracted to forest fires across large distances. (b) Scanning electron micrograph of one M. acuminata sensory pit with 150 sensilla and (c) showing each sensillum having a top dimple used to filter wavelengths (with permission by Elsevier).