I went for a wander through some tide pools the other day. The flats were shallow and productive, full of algae and little fish, hermit crabs and snails:
But besides the cowries and more typical-looking snails, I found this guy:
He may look distinctive in this photo, but he’s only about an inch long and I nearly stepped on him- he’s all the same colors as the surrounding sand and algae. Camouflage is good most of the time, but I’d have felt really bad if his turned out to be too effective.
My feet were in the water, since there were no dry places to step- I really did have to keep an eye out. Especially when I looked into a slightly deeper pool to see a little brown cephalopod scuttling across the bottom, arms tucked underneath- I leaned in and shuffled very carefully closer, hoping for a cuttlefish or a baby reef octopus. The golf ball below blanched and then flashed blue, and I snapped this photo before backing off rather hastily:
It’s enough to confirm the presence of a blue-ringed octopus, one of the most venomous marine animals in the world. That angry little golf ball that changed direction and charged at my toes contained enough potent and antidote-less venom to kill me in minutes. “Not aggressive,” it says on Wikipedia. Well, as far as I know I didn’t do anything to make it mad. Perhaps it didn’t sleep well, or perhaps it wasn’t expecting any observers of its afternoon hunting and was embarrassed at the state of its hair.
Anyways, it was really blue and quite agitated, so I decided to get out of its way. It turned and headed deeper into its little pool as I watched from a nearby rocky perch, so it may not have been aimed at me anyways… I really wasn’t terribly interested in finding out for sure.
Fun fact: every photo in this post has, as its subject, a member of the phylum Mollusca. Shelled, invertebrate, mantled- each cephalopod or gastropod (brain-foot or stomach-foot, respectively) here descends from a hypothetical limpet-like ancestor. Evolution is neat! And just because I love evolution so much, here is a bonus sea hare, about the length of my hand:
Hooray! Go explore something!