Difference of Sunda Pygmy and Gray Capped Woodpecker

	Gray Capped Woodpecker	Brown capped Woodpecker
Other name	Gray headed pygmy woodpecker	Sunda woodpecker, Malaysia Woodpecker
Upperpart	Black, wings, lower back and rumped black broadly barred with white	Browner with white barred Generally sooty compared to black of Gray Capped
Underpart	Lack of red on streaked brownish buff to black Belly buffish-orange	Dirty white below with brown streak
Tail	Central tail feather lack of white bar	Central tail feather always white barred Rump and upper tail covert white
Head	Crown gray, malar stripe usually faint or lacking. Broad dark patch on ear covert	Brown crown, white unmarked throat, broad distinct malar stripe
Sex	Male: Small red streak on side of hind crown Female: Average slightly larger than male. Red of male’s crown sides and naped replace by black	Male: Red streak behind eye Female: Slightly larger than male. Lack of red on hindcrown

Photo reference

Gray Capped Woodpecker

Sunda Pygmy Woodpecker

Reference

Ben F.King & Edwards C.Dickson, 1989, A Field Guide To The Birds of South-East Asia, Collins, Grafton Street, London

Boonsong Lekagul & Philip D.Round, 1991, A guide to the Birds of Thailand, Saha Karn Bhaet Co., Ltd Bangkok

David R Wells, 1999, Birds of The Thai Malay Peninsula,Academic Press, London UK

Hans Winkler, David A. Christie & David Nurney, 1995, Woodpecker An Identification Guide to the Woodpecker of the World, Houghton Mifflin Company, Boston New York

James A. Eaton, Bas van Balen, Nick W. Brickle & Frank E. Rheindt, 2016,  Birds of the Indonesia Archipelago Greater Sundas and Wallacea, Lynx Edicion, Bercelona

Salim Ali & S. Dillon Ripley, 2001,  Handbook of the Birds of India and Pakistan Volume 4 Frogmouth to Pittas,Oxford University Press , New Delhi