Elapid and BigBoat, thanks for the info. on HT. I learn more on the forum than I do from reading the main site. Amazing that HT depresses with intense exercise (never knew that), yet these guys would register high values during races.
Not sure why I read that even the average dog has very thick blood; not sure what the reference is to, but am sure I read they have very sludge-like blood. Maybe it's not HT related. I don't know. Wikipedia VO2 max article says Iditarod sled dogs have VO2 maxes of 240! Whoosh! (3x Lance Armstrong's).
That article also notes Lemond at a reported 92, and Bjorn Daelie, the Norwegian XC skier at 96 (possibly over a 100, as 96 reading was taken out of season!). I believe the XC skiing figures (whole of body work: arms, back, legs, shoulders, everything, and lots of hill climbing, whereas bike is really legs alone). Daelie was something else. Still remember his races.
Something else I read while ago: the V02 max of even the most sedentary draft horse is in the 100's. Just found one site, with V02 max of thoroughbred racehorses at 180. Irony: there are big doping problems in horse racing, too. Trainers even use Polar HRM's on horses (training zones etc.).
http://www.tufts.edu/vet/sports/oxygen.html
The endurance kings may be the pronghorn antelope in the U.S. West. Can sustain 40mph for 30minutes, and would finish a marathon in 40 mins apparently. But strangely VO2 max seems to be lower than horses.
http://discovermagazine.com/1992/dec/thepronghornspro172
Or maybe it's those birds that migrate from New Zealand to Alaska, right across the Pacific, in one hop, with no stops. Now that's performance.
Check out the critter's nose (beats Trek aerodynamics any day).
http://alaska.usgs.gov/science/biology/shorebirds/barg_updates.html
One politically incorrect question: what is the typical HT value for a female vs. male (speaking human beings here)?