A man in Sydney filmed as he rescued a giant blue robber fly trapped in his home and released it into his garden.

After carefully picking up the insect from the window, the filmer slowly walks outside allowing it to fly off.

They told Newsflare: "This nice giant blue robber fly seemed pretty angry at being trapped inside the window, so I was a tad wary about catching it at first as I didn't know if it would try to bite me or not - I was blissfully unaware of it at the time, but they have a ferocious reputation for being quite aggressive!"

The robber fly family are also called assassin flies due to their notorious predatory habits. They are known to wait and ambush their prey in flight.

Austral Entomology researchers reported that the larvae of these flies are also not to be messed with as they have backwards-pointing teeth as well as a tube used to inject venom into their prey.

This footage was filmed in December 2013.

This nice big Giant Blue Robber Fly seemed pretty angry at being trapped inside the window, so I was a tad wary about catching it at first as I didn't know if it would try to bite me or not - I was blissfully unaware of it at the time, but they have a ferocious reputation for being quite aggressive! I got some nice shots - they get better towards the end, so fast-forward if you get bored!

Sorry about the audio, there seem to be some rather severe noise reduction artefacts going on there, but I wanted to record the LOUD BUZZING these big guys make, which you mainly hear at the start and end.

From https://en.wikipedia.org/wiki/Blepharotes_splendidissimus "Blepharotes splendidissimus is a robber fly in the family Asilidae found in Eastern Australia. Recognised by its shiny black abdomen, it is the second largest of its genus. It was described by the German naturalist Christian Rudolph Wilhelm Wiedemann in 1830."