Asked by: Savio, Malta
They have probably picked out your aerial because of its brightness. Dragonflies are hunters, and the two types that hunt near the ground or over water (the ‘skimmers’ and ‘chasers’) wait on a perch until they spot their prey, and return to the same perch to eat it. They tend to select bright, light objects as perches, probably because such objects are more easily picked out from a distance.
Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.