Justification of Red List Category
This raptor was recently-described from fossil records, and likely accounts for observations of owls on Bermuda in the early 17th century. It is long Extinct.
No extant population remains.
Aegolius gradyi is known only from Bermuda, where it was described from fossil remains from Bermuda by Olson (2012), who in reviewing accounts dating from the early 1600s, considers it likely to have persisted into the historic period.
Nothing is known, although it presumably inhabited native forest.
The cause of extinction is unknown, but may have been driven by the decline of native cedar and palmetto trees following human colonisation, along with the arrival of alien predators and competitors (Olson 2012).
Text account compilers
Symes, A. & Taylor, J.
BirdLife International (2018) Species factsheet: Aegolius gradyi. Downloaded from http://www.birdlife.org on 17/12/2018. Recommended citation for factsheets for more than one species: BirdLife International (2018) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/12/2018.