What is Street Creatures?  This is the game I run on Twitter every Friday. I’ve
collected all the past quizzes here in one place so you can either relive them, or play
them for the first time.

How does it work?  Provided are four, seemingly unrelated clues, that are all
connected by a wild organism that can be found in a city. Look at the four clues,
do some research, and when you think you’ve figured it out, click on ‘Answer’
to reveal what connects the clues, and how they are connected.

Follow me on Twitter to play #StreetCreatures live every Friday at 9am PST.

Quiz #72 Clues

Horny operculum

Answer (Don't click until you've solved it)

Lewis’s Moon Snail (Neverita lewisii)


This moon snail lays eggs by sandwiching them together between layers of sand, creating something called a sand collar. You can find these scattered on beaches in spring and summer.


After the moon snail eggs hatch, they turn into veliger larvae, and drift into deeper water where they feed on diatoms before they mature and turn into carnivores.


One sure sign of the presence of moon snails, because they live beneath the sand and are hard to find, are the distinct countersunk holes drilled in clams, always in the umbro. Octopus holes in contrast are not countersunk.

Horny operculum:

This species’s operculum is horny and the snail uses it to shut itself inside its shell, which it does by expelling a great deal of water first. But it can’t stay there long because it can’t breath inside.
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