The Jack-In-A-Box of reptilian genitalia. The alligator penis is a unique anatomical feature, permanently erect but only emerging when necessary. Unlike other animals that rely on blood or lymphatic fluid for erection, the alligator penis maintains its rigidity due to a dense network of collagen fibers within the penile shaft. This constant state of readiness means that … [Read more...] about The Alligator Penis Is Permanently Erect, But Pops Out Only When Needed