They were built for speed and agility, growing to 3 meters in height, with big hooked beaks and sharp talons these animals could outrun and easily kill a human. These beastly birds had an average speed of 60 miles/hour and were a force to be reckoned with. Their main weapon was their talons, which could deliver a nasty kick. These animals probably hunted in open grasslands where prey was fast and agile. Their incredible height enabled them to scan far and wide in search of food.
Another giant flightless bird was Diatryma (also called Gastornis), a gigantic 2 meter tall behemoth. It lived 56-41 million years ago and was distantly related to modern ducks. There is much controversy surrounding this beast. It is popularly argued as a carnivore (the idea of a giant killer duck is appealing), but when looking at the skull the beak was blunt and not hooked like birds of prey today.
There is a lack of other large carnivores in the areas Diatryma occupied. Therefore I still keep an open mind on the subject of its diet. It may yet prove to be carnivorous.
Diaryma as a mascot, I think not, too soft for me, but still an awesome animal. A parrot on steroids.