Source: http://commons.wikimedia.org/wiki/File:Chimpanzee_%28PSF%29.jpg This image was donated by Pearson Scott Foresman, an educational publisher, to Wikimedia Commons, and is thereby in the Public Domain. 未选中 动物 哺乳动物 灰度黑猩猩
orangutan wood cut illustration from 1923 "ABC Book" by C.B. Falls (LCCN: 23002228); http://openlibrary.org/b/OL13440008M 猩猩 灵长类动物 动物 猩猩木切
This image was donated by Pearson Scott Foresman, an educational publisher, to Wikimedia Commons, and is thereby in the Public Domain. --- See http://commons.wikimedia.org/wiki/Category:Pearson_Scott_Foresman_publisher 动物 哺乳动物 生物学 轧制线顶杆