Wooden frame with apparent plaster decorative design over the wood.

The pictures? were hanging in my Grandfather's farmhouse probably in the 1940's. I have no idea of their origin nor the medium for the birds ? Painted?? If anyone has information on framed birds such as these, I would love to learn their history. The dimensions are 8.5" W x 10.5"T, wooden frame with what appears to be a decorative layer of plaster. Have not removed the pictures from the frame for fear of damaging the frames and/or the pictures.