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Just testing the high ISO of the 5DS R on subjects that it was not marketed to handle. 
Chestnut Munia (Lonchura atricapilla) by alabang, on Flickr
The Chestnut Munia (Lonchura atricapilla) (formerly considered as a subspecies of the tricoloured munia Lonchura malacca atricapilla), also known as black-headed munia, is a small passerine bird. This estrildid finch is a resident breeding bird in Bangladesh, Brunei, Cambodia, China, India, Indonesia, Laos, Malaysia, Burma, Nepal, Philippines, Singapore, Taiwan, Thailand, Vietnam and Hawaii.
Before 1995, it was the national bird of the Philippines,[2] where it is known as mayang pula ("red maya") because of its brick red patch on the lower back which is visible only when it flies. (This distinguishes it from other birds locally called maya, notably the predominantly brownish "mayang simbahan" (tree sparrow)[3] which is more common in urban areas.)
Source: https://en.wikipedia.org/wiki/Chestnut_munia
Location: https://en.wikipedia.org/wiki/Muntinlupa
Camera
Canon EOS 5DS R
Lens
Canon EF 800mm f/5.6L IS USM
Focal Length
800mm
Shutter Speed
1/320 s
Aperture
f/5.6
ISO/Film
2500
Chestnut Munia (Lonchura atricapilla) by alabang, on Flickr
The Chestnut Munia (Lonchura atricapilla) (formerly considered as a subspecies of the tricoloured munia Lonchura malacca atricapilla), also known as black-headed munia, is a small passerine bird. This estrildid finch is a resident breeding bird in Bangladesh, Brunei, Cambodia, China, India, Indonesia, Laos, Malaysia, Burma, Nepal, Philippines, Singapore, Taiwan, Thailand, Vietnam and Hawaii.
Before 1995, it was the national bird of the Philippines,[2] where it is known as mayang pula ("red maya") because of its brick red patch on the lower back which is visible only when it flies. (This distinguishes it from other birds locally called maya, notably the predominantly brownish "mayang simbahan" (tree sparrow)[3] which is more common in urban areas.)
Source: https://en.wikipedia.org/wiki/Chestnut_munia
Location: https://en.wikipedia.org/wiki/Muntinlupa
Camera
Canon EOS 5DS R
Lens
Canon EF 800mm f/5.6L IS USM
Focal Length
800mm
Shutter Speed
1/320 s
Aperture
f/5.6
ISO/Film
2500