Portal:Animals/Did you know/1

• ...that Turritopsis nutricula can revert to the polyp stage after reproduction, and therefore is theoretically biologically immortal?

• ...that Carolus Linnaeus' (portrait pictured) research on classification led to objections and rebukes from religious authorities?

• ...that sponges are classified as animals, rather than "Parazoa", as once thought?

• ...that Lampreys are called "nine-eyed eels" (i.e., per side) from a counting of their seven external gill slits on a side with one eye and the nostril?

• ...that all organisms on Earth are descended from a common ancestor or gene pool?