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Leo Tolstoy Sparrow and Swallow Sparrow enter the swallow's nest. what is the purpose?

Reproduction. Lev tolstoy was a Russian critical realist writer, political thinker and philosopher in the mid-Kloc-0/9th century. His masterpieces include War and Peace, Anna karenin and Resurrection. Leo Tolstoy Sparrow and Swallow Sparrow entered the swallow nest in order to reproduce. Sparrows can't build nests. Sparrows couldn't find a breeding nest, so they stared at the swallow's nest.