Black Woodpecker
Dryocopus martius
The black woodpecker measures 45 to 55 cm (18 to 22 in) long with a 64 to 84 cm (25 to 33 in) wingspan. Body weight is approximately 250 to 400 g (8.8 to 14.1 oz) on average. Among standard measurements, the wing chord is 22.7 to 26 cm (8.9 to 10.2 in), the tail is 15.9 to 17.3 cm (6.3 to 6.8 in), the very long bill is 5 to 6.7 cm (2.0 to 2.6 in) and the tarsus is 3.6 to 4 cm (1.4 to 1.6 in).
ID text from Wikipedia, CC BY-SA 4.0

White-bellied Woodpecker
Dryocopus javensis
This species is one of the largest living species of woodpecker. Adults range in size from 40 to 48 cm (16 to 19 in) and are behind only to the great slaty woodpecker and black woodpecker in size among Asian woodpecker species. The species is considered closely related to the more northern black woodpecker and the North American pileated woodpecker and is similar in size to these species. Body mass can vary from 197 to 350 g (6.9 to 12.3 oz). Among standard measurements, the wing chord is 20.5 to 25.2 cm (8.1 to 9.9 in), the tail is 14.3 to 18.9 cm (5.6 to 7.4 in), the bill is 4.6 to 6 cm (1.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Black Woodpecker and White-bellied Woodpecker.