Funnily enough, Brontornis does now most frequently get placed in Anserimorphae alongside waterfowl, whereas it was previously most often thought to be a terror bird (though I should say there’s still plenty of debate). It’s thought to be heavier than any terror bird at possibly as much as 400kg - where the average horse apparently weighs 500kg.

Being extinct, I assume no one ever told it how to get to Sesame Street.