Female adult human botfly (D. hominis).

Human botfly (D. hominis) larva, with an arrow pointing out the mouthparts.

Red alder leaf, showing discolouration caused by ozone pollution.

MODIS tracking of contrails generated by air traffic over the southeastern United States on January 29, 2004.

Sulfur dioxide cloud released following the January 27, 2005 eruption of Manam. Data provided by the OMI aboard NASA's Aura satellite.

Adult of Macracanthorhynchus hirudinaceus.