This is a literature retrieval webpage where users can search for literatures related to ducks published in the past 20 years. By entering the pubmed ID, title, author, or part of the abstract and clicking on the search button, users can obtain relevant information about the literatures. By inputting more information rather than just one or two words, users can obtain more precise search results. If you wish to download or read more detailed information, the website also provides you with external links.