Sharaf al-Zamān Ṭāhir al-Marwazī or Marvazī (; fl. 1056/57–1124/25 CE) was a physician and author of Nature of Animals ( ).
He was a native of Merv, part of the Khorasan region in modern-day Turkmenistan.
Nature of Animals Al-Marwazī drew upon the works of Aristotle, Dioscorides, Galen, Oribasius, Timotheos of Gaza, Paul of Aegina, and the Muslim scholar Al-Jahiz. The work comprises five parts: On human beings On domestic and wild quadrupeds On land and marine birds On venomous creatures On marine animals
Physician Al-Marwazi served as physician at the courts of the Seljuk Sultan Malik-Shah I and his successors. As a physician, he recorded observations of parasitic worms.
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