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 #61 Clues

Aristotle’s lantern
Broadcast spawning

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

Eccentric Sand Dollar (Dendraster excentricus)


Like all sea urchins, this flattened version has larvae and the first larval stage is called a prism and they have no arms.


Sand dollars have a flower pattern on them which is obvious when they are dead. The Eccentric Sand Dollar is unique in this being off-center, hence the name ‘excentricus’.

Aristotle’s lantern:

Sea urchins and sand dollars have a complex structure of a mouth made up of plates. Aristotle described this structure in his book, Historia Animalium, saying it resembled a horn lantern.

Broadcast spawning:

Sand dollars and many marine invertebrates reproduce by broadcast spawning in which the females spew eggs en masse into the water and the males fertilized them.
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