Mark Twain's The Lowest Animal

In Mark Twain’s “The Lowest Animal” he successfully compares how humans descended and degenerated to be the lowest animal on the planet. His assumption is that the Higher Animal is not humans, but animals as a superior species.
First, Twain compares a buffalo hunt were people killed much more than was needed just for sport, to an anaconda cage where the reptile killed for food. His assumption was that humans kill for cruelty whereas the anaconda showed no signs of cruelty and left the remaining calves alone. Twain’s experiment didn’t lead into when the next time the anaconda became hungry thought, so I must believe the analysis was not necessarily complete.
Secondly, Twain compares humanity’s want of accumulation of wealth to animals