A Drone Fly (Eristalis tenax [thanks, Kane Slater]) diligently guards a small territory above a pond. This little critter chased away any insect that dared intrude, including other fly species, damselflies and crane flies.
Canon Rebel T1i (500D)
Canon EF 300mm 1:4 L IS USM
Canon EF 1.4x II Extender
420mm, 1/640s, f / 8, -1/3 EV, ISO 400
Queen Elizabeth Park, Vancouver, BC
11 May 2010