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

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

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

8. Grand (1992)

9. ?
Grand (1992)

10. Dearolf et al. (2000)

11. ?
Dearolf et al. (2000)

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

14. Dearolf (2003)

15. Dearolf (2003)