Black-necked Crane
Grus nigricollis
This medium-sized crane is mostly grey with a black head and neck. The lores and crown are naked and dull red. A small patch of white feathers are present below and behind the eye. The tail is black and makes it easy to distinguish at a distance from the similar looking common crane which has grey tail.
ID text from Wikipedia, CC BY-SA 4.0
Demoiselle Crane
Grus virgo
The demoiselle is 85–100 cm (33.5–39.5 in) long, 76 cm (30 in) tall and has a 155–180 cm (61–71 in) wingspan. It weighs 2–3 kg (4.4–6.6 lb). It is the smallest species of crane. The demoiselle crane is slightly smaller than the common crane but has similar plumage. It has a long white neck stripe and the black on the foreneck extends down over the chest in a plume. It has a loud trumpeting call, higher-pitched than the common crane. Like other cranes it has a dancing display, more balletic than the common crane, with less leaping.
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-necked Crane and Demoiselle Crane.