The Deinocheirus is an exceptionally large onrnithomimid, much bigger than Gallimimus and Ornithomimus. It also has a very different body structure, and is slightly slower. It is currently the only amphibious omnivore, albeit with a measly 30 oxygen.
A very blocky Deinocheirus that doesn't appear to have any feathers
Swan Deinocheirus is an Easter skin for Deinocheirus, available in Easter eggs on the new map. The skin is a swan, and allows Deinocheirus to swim with no major speed issues. It's a very reasonable dinosaur/omnivore, next to the gigantoraptor's stats/gameplay. When it run's it flaps it wings, as if trying to fly.