Just why i like Birds on Stamps collecting

Why I like to collect Birds on Stamps.

Look at these nice images of Birds from 1965 It's art, it has value and it is international wanted, so tradable. And it takes little room to store and it's easy to transport.

My collection started with these serie. Now I have almost 25.000 stamps with Birds on it. Any birds on stamps collectors on CW?

I don't collect US Duck Stamps... so far..

I will post weekly some more nice examples on Birds on stamps. Nice for your collection on CW.

Question: Why isn't there a sub-category of Birds on Stamps to post this item? How can this be arranged? I see butterflies, owl...