Fiber-type profile Slow-twitch long contraction times fatigue-resistant aerobic Fast-twitch short contraction.

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Fiber-type profile Slow-twitch long contraction times fatigue-resistant aerobic Fast-twitch short contraction times fatiguable anaerobic

Altricial Naked Eyes closed Little ability to move on their own Precocial Furred Eyes open Ability to move on their own

Intermediate Some hair Eyes open Little ability to move on their own

Grand (1992)

? Grand (1992)

Dearolf et al. (2000)

? Dearolf et al. (2000)

Methods Detailed dissections of stranded animals Adults Neonates Weighed brain and muscle Collected locomotor muscle samples Muscle histology – myosin ATPase staining

Dearolf (2003)

Dearolf (2003)