Feast-Or-Famine is a 15 letter English word. It's valid Scrabble word worth 8 points. It's valid Words with friends word worth 8 points.
You can make 2031 anagrams from letters in feast-or-famine (--aaeeffimnorst).
However, much variation can be expected in an animal whose physiology must be adapted to a feast-or-famine existence.
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