Interesting fact: The relationship between body size and needle length is most impressive in diadem sea urchins. They themselves have a diameter of 5-7 cm, and their needles can grow up to 50-70 cm. #RandomThoughts
Log in to join in Reading is open to everyone. Replying needs an account.
1 comment
Well, I've learned something new today. That's really impressive given that the body is smaller compared to its spikes