I scrounge fallen feathers, nests, egg shells, and butterfly wings along with the occasional moss.
The moss goes in a big pickle jar or one of the extra coffee pots that I seem to accumulate. Moss can be grown easily in a closed jar. A layer of potting soil, a couple three teaspoons of water, a nice rock, the moss and close it up. An hour or so of direct sunlight is not too much, but other than that these little gardens are pretty carefree. If you get the moisture right, everyday has a micro-weather cycle of cooling, condensing on the glass as the temperature rises and rainfall down the sides as the temperature drops. If it feels like it's too wet inside, take the lid off for a time. A monarch wing strategically placed and one can imagine a tiger named Hobbes ready to pounce from a green carpeted forest glade.
I've got a moss growing inside a jar--I lay the jars on their sides for more space-- from my first in the woods, off leash, learn my whistle outing with Frank. A little over a year now.
Feathers and nests ( the downy woodpecker entire shoulder wing walk, the hawks wing right shoulder 5 feather walk, the single bluejay feather walk...) are on display nearby with feathers pin cushioned into nests. If we are lucky and stay healthy, my collection will span a over a decade and tell some of the story of me and my dog over the years.
I was at the library over the weekend and came across a quasi-bird book, The Feather Thief
( Kirk Wallace Johnson) It's an enjoyable read if you like birds, are concerned about bird populations, have an interest in evolution, are fascinated by jungle exploration, like stories about crooks and hats and crazy English Lords... natural history, museums, ship wrecks... and feathers.
It's all about the feathers.
From the opening page...
"Man is seldom content to witness beauty. He must posses it."