hawkeye - where it reads "Most aquatic turtles can tolerate extremely high levels of carbon dioxide in the blood." i assumed it meant they could handle a blood with a low pH... i mean no matter how good a buffer, large amounts of Co2 are always going to make blood more acidic - maybe something that's a poison to humans isnt to turtles.
Anyway i found that entire article great - you should check it out if you're interested
