3 links
Four and Twenty Piebirds
antiquepickers.co.uk
Site offers piebirds also known as pie vents. Items are not featured online, request information by e-mail.
My Piebird Page
festivalusa.com
Description of pie birds and how to use them, with photographs and information about a collectors convention.
Pie Birds, America
comdak.com
Original, handcrafted Ceramic Piebirds by Carmack. Choose from many skillfully designed birds, or submit ideas for custom created caricatures.