Hi Nonny, thanks for asking. First off I have to give you the mundane answer and that is that it may just be moulting season in your area. Always consider that not everything is a sign first, because sometimes nature’s cycles create events that may seem meaningful when it really just falls into the natural cycle of things. Also who am I to say that they aren’t meaningful for you? Something that is meaningful to one of us might not mean jack to someone else, so trust yourself and your gut foremost.
There’s also the matter of not collecting feathers of birds that are protected by the MBTA. Look, take pictures, and then leave them where they are. It sucks, I know, but there are solid reasons behind the laws and it all has to do with protection for our lovely feathered friends.
Now, onto the woo… Feathers usually indicate messages or messengers, especially if the black on is from a Corvid (crow, raven, etc). There’s also belief that feathers are a sign of ascension and spiritual connection and others believe that finding feathers on your path are signs from loved ones who have passed on.
Ultimately the meaning, if you decide there is any at all, is up to you and you alone. Search the web for symbolism and see what resonates with you the most and go from there.
Thanks again for asking, Nonny. Have a wonderful night.