Most animals change proportions as they grow. A coiled shell doesn't have to. Add one turn and the whole shell is just 2.2x bigger, same shape. Watch this one grow forever without changing at all. 🧪🐌 #HowToBuildAGiant #MarineLife

Some glass sponges may be the oldest animals on Earth. Individuals of Monorhaphis chuni are estimated at over 11,000 years old, and they build a single skeletal spike up to 3m long, the largest natural glass structure any animal makes. 🧪 #SpongeThursday #HowToBuildAGiant #marinelife