Which animals can eat thistles, nettles;without any discomfort ?

Animals which feed on grass and hay have specially strengthened membranes of the mouth, and do so
without pain or discomfort. The delicate membrane which lines the mouths of human beings and animals
which live on soft foods prevents them from eating any­-thing like hay. The mouth of the donkey is very tough,
and it feeds on thistles with impunity.



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