I prefer pigeons. Ha, ha, ha. Not sure if they are "on earth" or not. And no so fast when walking/ waddling... But hey, they may make the RadioShack team, and there's this....
Note this pigeon beat an ADSL [ha, ha, ha] line recently in this race, and it was not allowed any performance enhancing bird seed, ROFLMAO:
"...there were strict rules in place [in the race with the ADSL line] to ensure he had no unfair advantage. They included "no cats allowed" and "birdseed must not have any performance-enhancing seeds within".
I'd bet pigeons' power to weight ratios are probably 100:1, taking a wild guess (no measly 6:1 for them), but measured in grams as weight LOL. Bertie is definitely third-rate compared to the avg. pige. Gotta get with the program.
Ha. Enjoyed both of those links. When I lived in Guelph, one of my favourite rides was next to the safari park. The very first time I rode that ride, a cheetah chased after us (without much difficulty I should add). It was a blast. Much more exciting than a dog. Glad there was one mighty big fence between us!