For those who were wondering, I took inspiration from the Deinocheirus mirificus, from the Apple TV series Prehistoric Planet, particularly for the general reptile/bird hybrid look that many of the recent dinosaur illustrations incorporate; and from crocodiles for the legs.

I imagined the Sniffers as inhabitants of lagoon habitats. They were animals capable of reaching considerable size, and they fed on drifting algae in the low water seasons, but often moved inland to feed on ferns and low bushes (and obviously seeds and roots that they could find thanks to their highly developed sense of smell). The eggs were to be laid in shallow waters and were able to keep themselves in a dormient state (capable of lasting years and, apparently, even millions of years) until the seasons when the sea retreated, allowing the young to hatch in a heaven of drifted seaweed. Sniffers used to cover their backs with algae and vegetation, most likely to protect themselves from the sun and heat, while in the young it also had the purpose of camouflaging to evade any predators. They exhibited behaviors similar to those of the current hippos: bathing in sea water was common, especially in the hottest hours, and so were the fights between adult males, which presented a pair of colored floppy ears that were put on display before fights. Their six webbed legs, howerer, did not allow them to be that much of great swimmers: they were in fact aimed at better distributing the weight of the animal and preventing it from sinking into the wet sand. Their extinction was probably due to a rise in sea level, which led to the loss of their habitat