re: Try this on for size
As the cartoon strip Pogo once said about the idea that either there are more advanced brains in the Universe or that we're the most highly intelligent species in the Cosmos:
"Either way, it's a mighty soberin' thought."
You can find the actual Pogo strip towards the beginning of Sagan and Shlokovski's 1966 classic work, Intelligent Life in the Universe.
http://www.ffbooks.co.uk/x0/x4635.htm