The other birds on these cards were created with stamps from the Hero Arts "Decorative Birds" set. There are 4 different birds in the set. Some have long legs and others have short ones. The legs can be masked and then some of the birds will appear to be flying.
The tiny bird on this card was created with the "Tiny Bird" stamp from A Muse Artstamps. "Happy Bird Day to You" is a stamp from Stampabilities.