Turtles can breathe through their butt. To be precise they can respire through their cloacal opening (anus) through a process known as cloacal respiration. Of course, turtles also commonly breathe air through nostrils located above the mouth.
Chinese water deer
Chinese water deer, a very small Asian deer of the family Cervidae, are native to fertile river bottoms in Korea and the Yangtze River (Chang Jiang) valley in China. It is the only species of deer in which males lack antlers; instead, they are armed with long, curved, and sharp upper canine teeth that protrude from the mouth. These tusks may exceed 5 cm (2 inches) in length.
To evade predators, water deer rely on hiding and on bursts of quick, rabbit like, bounding flight. Generally, they are encountered alone; observations of captive animals suggest that males use their tusks to defend territories. Water deer prefer the lush vegetation that grows along river bottoms; there they eat a surprisingly large amount of coarse-fibred grasses that serve as both food and cover.