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.

[vc_accordion][vc_accordion_tab title=”Quiz #58 Clues”]

Crustose Lichen
Smoked Salmon

[/vc_accordion_tab][vc_accordion_tab title=”Answer (Don’t click until you’ve solved it)”]

Red Alder (Alnus rubra)



Red alder is well known as a nitrogen fixing tree, but it accomplishes this magic with the help of Frankia, a symbiotic bacteria that lives in nodules on the tree’s roots.

Crustose Lichen:

The red alder is often thought of as having white bark, but that’s actually all crustose lichen, the bark is naturally gray, which becomes apparent where the air quality is not high, like in cities.

Smoked Salmon:

The wood of red alder is commonly used to smoke salmon and helps flavor the fish.


Starting in 1956, the guitar maker Fender began using red alder to create some of their guitars. It was abundant in the region and easily accessible and musically, the wood resonated well.