Somehow this early fascination with life's prodigality, with wet, slimy or creepy-crawly things, becomes systematized and methodical.

Somehow this early fascination with life's prodigality, with wet, slimy or creepy-crawly things, becomes systematised and methodical.

It uses so much energy producing the slimy mucus and crawling over it that a mouse traveling the same distance uses only one twelfth as much energy.