粪便，动物的排泄物，如果被用到土地上的话，是一个很好的肥料，可以促进植物的生长。
Shits, animals' excrements, are a fine fertilizer which will promote the growth of plant if being applied in the land.
感染拉沙病毒的Mastomys 鼠并不发病，但它们可将病毒排放到其排泄物（尿和粪便）中。
Mastomys infected with Lassa virus do not become ill, but they can shed the virus in their excreta (urine and faeces).
“19世纪人类只有自然化肥可以使用，例如动物粪便，”Litaker说，也就是鸟类、鼠类和海豹的排泄物。
"In the 1800s people had to use natural fertilizers such as guano, " which is the excrement of birds, bats, and seals, Litaker said.
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