Nossie is the name of a species of one-horned sauropods similar to a Apatosauri first seen in the Dino Dino Jungle course of Mario Kart: Double Dash!!, where the light blue one serves as one of the main obstacles of the course. While the Nintendo Official Guidebook and site of Mario Kart: Double Dash!! only use the term Nossie to refer to the light blue one, internal data indicates that the red and yellow one found in the course are Nossies as well.
Mario Kart series
Mario Kart: Double Dash!!
Nossies first appear in the Dino Dino Jungle track of Mario Kart: Double Dash!!. There the light blue one mainly acts as a hazard for the racers passing near it in the canyon, being able to stomp them with its feet. It can also be met when passing on the wooden bridge that crosses the canyon, where it is able to make the karts spin with its head.
Mario Kart 7
The light blue Nossie reappears in the GCN Dino Dino Jungle track of Mario Kart 7, in the same place where it is found in the original course. The main difference is that in this course, this Nossie stretches its neck, making it an obstacle for the drivers gliding above the wooden bridge.
Mario Kart Tour
The light blue Nossie appears again in the GCN Dino Dino Jungle track of Mario Kart Tour, presumably with the same role.
Mario Party 8
Names in other langauges