Well, Mr. Mahin Guest,
You're right-- things do go extinct all the time.  We naked two-legged apes are quite new to the fauna register, in fact.  Who knows when it'll be our turn?

Spikepole, cows weren't on the endangered species list the last time I looked.

Right on, Banjer!

Brilliant idea, Paul G.

Amos, you do wax so poetically!

Genie  ª; )