Saiga antelope

The saiga's huge, mobile nose drapes over its mouth like a deflated trunk, and it is built for the steppe's extremes. Each nostril is a sac lined with mucous membranes, which may help filter dust out of the air in dry summers and warm and moisten frigid air before it reaches the lungs in winter. The nose has a social job too. Males make loud nasal roars that are thought to advertise their size and condition and help them win females. Seen in profile, with that muzzle hanging over the lips, the saiga looks like an antelope wearing a costume nose, yet every part of it earns its keep.