Take a look at this terrific paper on how to separate ringtail Hen Harriers, it is fascinating and supported by many great photographs.
The author is Gerold Dobler who led the design teams for SF binoculars and Harpia scope at Zeiss.
https://www.zeiss.com/consumer-products/int/home/local/nature-observation/hen-harrier.html
Lee
The author is Gerold Dobler who led the design teams for SF binoculars and Harpia scope at Zeiss.
https://www.zeiss.com/consumer-products/int/home/local/nature-observation/hen-harrier.html
Lee