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| | Foolish Heart, Hagfish Hearts |
 | | In all creatures, the size of the heart is proportional to body mass, and usually the smaller the heart, the faster the heartbeat: in one minute an elephant heart beats 25 times, the human heart beats 70 times, the shrew heart beats 600 times. |
 | | The hagfish is a sea lamprey, an eel-shaped, funnel-mouthed creature that eats live or dead fish. |
 | | The huge-yolked eggs of the hagfish are found in lonely clusters of 10-20 on the deep ocean floor, especially around the continental shelf. |
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