Nile crocodile. From its dung combined with honey, a contraceptive for women was obtained
If men got away with making a rudimentary condom (https://www.pilloledistoria.it/4321/storia-antica/preservativo-degli-antichi-egizi), the women of Ancient Egypt relied on contraceptive methods to say the least evocative, obtained from natural ingredients, but to make the skin crawl.
The Kahen papyrus is an ancient medical text dating back to 1850 BC. about, from which we are promptly informed on the gynecological knowledge of the time, including contraceptive systems; one of the most common for the Egyptian ladies was to insert in the private parts a sort of "cap" made with crocodile excrement (an animal held in great esteem in Egypt, so much so that it was mummified) mixed with honey, which would have constituted, according to them, a barrier to the possible penetration of spermatozoa inside the uterus.
If it worked, however, we do not know (Photo taken from:tuttimattiperigatti.forumcommunity.net).