The web of the spiny orb-weaver spider is an amazing feat of engineering, built from multiple types of silk, each with a particular function.
Credit: Rachel Barry
Pom Pom crab (Lybia tessellata)
The ‘pom poms’ are stinging sea anemones which the crabs use to catch food and elude predation, the tentacles are covered in stinging cells called cnidocytes
In return for this protection, the crabs feed the sea anemones
Population density thread because you and I both know you have nothing better to do.
Let's start with this cool way to visualize population density, by @undertheraedar. The height of each spike displays the population density in that location.