Gould wrote an emended description and commissioned Henry Constantine Richter to produce a new plate, this was issued in the 1848 volume of the same work.

[4] The species has mainly grey upperparts and white underparts, darker on the tips of the flight feathers and with a yellow cere.

[7] Both of the collectors of Gould's specimens were effusive in their praise of this falcon's appearance, Sturt's field note says it had a "delicate beauty", and when Gilbert obtained his second specimen in August 1842 he wrote, I assure you I never gazed with more delight on any Specimen I ever Shot, than on this Bird, as it lay in the grass, throwing up its feet to prevent my hand reaching it.The grey falcon is an Australian endemic, usually confined to the arid inland.

When they have been occasionally seen outside of these areas, they have been found in similar dry, low altitude, open woodland or grassland.

[8] In Sturt's notes to his 1845 contribution to Gould's set of specimens, collected at the interior of New South Wales, he commented that the pair were the only individuals to be seen in their seventeen-month exploration of the region.

From 88% of observations it can be said that their main prey is other birds, followed by small mammals (6%), reptiles (5%) and invertebrates such as locusts and worms (1%).

Grey falcons have also been sighted with animals such as; a mallee ringneck, a duck, a yellow-rumped thornbill, locusts, snakes, the house mouse, rabbit kittens, lamb carcasses and one has even been seen pursuing a bat.

[10] Analysis of mitochondrial COI DNA sequence variation for grey falcons found low genetic diversity, indicating that the species can be managed as a single population.

Grey falcon are listed as endangered on the Australian Environment Protection and Biodiversity Conservation Act 1999.