Some birds and mammals have very high aerobic exercise-to-resting ratios, but no tachyaerobic animal has a reptilian resting metabolic rate.

• 一些鸟类和哺乳类活动时的耗氧量与休息时耗氧量的比值很高，但是没有一种高耗氧动物有爬行类那样低的休息时的代谢水平。