Birds on Bikes - bird-themed caches that you can find while out on a bike ride.
Wrens are very energetic birds that fly close to the ground. They hop and dash around along the ground, probing crevices to find insects. Almost sounds like a geocacher on a bicycle, don't you think?

This new addition to the "Birds on Bikes Series" is a challenge cache. The cache IS at the posted location. Any finder can sign the physical log when they find the cache. However, you can only log it as "FOUND" online after the log is signed and after the challenge task has been met and documented via the challenge checker below.
Challenge task: you need to have found at least 15 geocaches of any type, anywhere in the world, that have the attribute "Bicycles Allowed". That should be easy, as the Birds on Bikes Series alone currently includes 14 other active hides (this find cannot count as one of the 15). If you have not yet satisfied the challenge requirements, you can still sign the physical log and post a note on the cache page.
Challenge checker: click the box below to verify that you meet the challenge:

Cache description: this one is along a nice, wide rail trail. It's partway down a soft shoulder, but not all the way down into the mucky part.
Congratulations to kingsqueen53 who were First to Find and more than satisfy the challenge requirements, with 510 such finds so far!