Re: what are the average lifespans of horses, cats, cows, penguins, porpoises,?

Hello, Travis.  This chart gives the average lifespans of a variety of animals, including horses, cats and cows.
According to the chart, the average lifespan of horses is 20-25 years (with the record being 50 years), for cats is 10-12 years (the record being around 26 years...or 3 years for each of the 
9 lives..just kidding), and for cows is  9-12 years (with the record of 39 years).

This Penguin FAQ site suggests  that the average lifespan of penguins is about 15-
20  years.

This site about Harbor Porpoises suggests that the average lifespan of harbor porpoises is about 
15 years, whereas  this site suggests that harbor porpoises only live about 8 years on average. 

On the other hand, this website says that the average lifespan for dolphins is about 20 years. These bits of 
information are not necessarily contradictory, as the harbor porpoises are considered to have the shortest lifespans among the cetaceans (dolphins, porpoises, and whales).