Corn, albeit not an animal has been pretty successful in terms of number of individuals. Their bi-pedal underlings have cleared swathes of land and take meticulous care of their well-being so they can bask in the sun undisturbed.
> The most successful at communicating their view that they are the most successful
To who? Other humans?
It's seagull mating season where I am, and I don't speak seagull, but I'm pretty sure one of the things they're trying to convey to their fellow seagulls is that they're extremely successful.
Can't argue with it either. They're very much alive, which is the best you can be in this particular competition.
So, the most successful at arrogance? In other words, the least successful at humility? Ironically, since humble and human share a common root. Just playing devil's advocate here, but what you propose is not a good metric to maximize.
Has another animal proposed they are more successful by a different metric?
Crickets?