The silkworms have gone into the bushes to spin their cocoons.

蚕上山了。

《新英汉大辞典》

Weaver ants, which spin silk cocoons to protect their larvae.

织叶蚂蚁，它们吐丝结茧，以保护自己的幼虫。

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Silkworms spin silk and wrap themselves in cocoons.

蚕吐丝并把自己包在茧里。

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Silkworms spin silk and wrap themselves in cocoons.

蚕吐丝并把自己包在茧里。

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