Thanks for the new photos.... the presence of the mud suggests a robin.
How is the bird getting into your garage?
.
Just type into Google "Robin nest" and click images. you see all types but most have mud holding them together. Robin chicks get quite large and I guess the mud strengthens the whole structure for them.
Here is a photo of a newly fledged robin sitting on my plant bench and resting waiting for a parent to bring food. (I keep my seedlings and flowers for upNorth on this bench until we leave and take them with us. There are no nurseries up there to buy from late in the summer.)
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.