This male Canada Darner ( Aeshna canadensis ) actively patrolled a large section of pond, probably on the hunt for mates. He interacted with the Paddle-tailed Darners and Four-Spotted Skimmers in the area, swooping at them in what were apparently territorial challenges. Or, he thought them all to be potential mates.
Canon Rebel T1i (500D)
Canon EF 300mm 1:4 L IS USM
Canon EF 1.4x II Extender
420mm, 1/500 sec, f / 8, -1/3 EV, ISO 640
UBC Botanical Gardens and Centre for Plant Research
26 Aug 2010