Which living creature has the largest size difference between the offspring and the adult? I realize theat there are many parameters in this questions. e.g., for a placental mammal, do you compare the fertilized egg to the adult, or the newborn to the adult? Also, how do you define living creature? If you give an answer, you should probably explain your parameters. Here are a couple of definitions to help arrive at an answer.
Animals (Wikipedia: Kingdom Animalia)
Living Creatures (Wikipedia: life)
My guesses would be:
Animal: blue whale, taking difference between fertilized egg and adult.
Living creature: Coastal redwood (example: Lindsey Creek tree) - I remember that coastal redwood “pinecones” are tiny, much smaller than the cone from a regular pine tree; or else, if you count colonies, the Shoestring Rot fungus
I don’t suppose there are any other candidates in the living creatures category, but are there any creatures in the animal kingdom that have a larger difference between offspring and adult? You could measure either total difference (adult mass - offspring mass = biggest number) or proportion (adult mass = X times offspring mass)