This is one of the films produced by Toei, who began producing educational films in 1954, as a teaching material film for schools. It tracks how many percent of the 10,000 eggs of the American White-tailed worm can safely become adults. During the observation process, the raison d'étaté of other natural enemies, as well as the clever mechanisms of natural balance are revealed.
January 1, 1972
Released
自然界のつりあい-動物の数は何できまるか
24min
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