...There is noclear stratification within the forest; in many parts of it there aredense growths of bushes, small trees, and palms...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...Five levels of stratification could bedistinguished...
F. Haverfield 「Roman Britain in 1914」
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lioness courtship travail
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