Aquatic Beetle

Some aquatic insects are ferocious – if miniature – predators, capable of killing prey much larger than themselves.
This water beetle larva breathes through spiracles at the end of its body while hanging upside down, waiting for its next victim. 
Once a prey has been spotted, the larva pounces decisively, holding its meal firmly in its huge jaws. It then anaesthetises and liquefies its insides so it can be easily ingested.