These are large birds and can easily be spotted around wetlands of India and mostly the habitat is similar for each one of them.

Stork : Out of 6 types Storks, Oriental and White Storks are rare.
Flamingo : They are mostly same in appearance but are categorized as Lesser and Greater Flamingos with difference in size and colour of beak
Pelican : There are 3 variety of Pelicans found [ Great white, Dalmation and Spot-Billed ]. Great White Pelicans are found Gujrat, Rajasthan, Haryana and other staggered parts of India and is most common of Pelicans. Dalmation pelican often are found with the group of Great White but Spot-Billed are difficult to spot.
Ibis : 2 varieties out of 3 are mostly similar [ Black and Glossy Ibis ]  whereas Black headed Ibis has got white body except for the neck and head.
Openbill : Very similar to White Stork and the unique gap between its upper and lower beak separates them from other storks.
Spoonbill : Spoonbills, as the name suggests, they have a spoon like beak.
Adjutant : Their broad long beak separates them from other Storks and also the Greater Adjutants have gular pouch and are absent in Lessers.