These are professionally prepared skeleton mounts. Each skeleton is cleaned and articulated in a natural posture on a wooden base with a removable clear acrylic cover.
This comparison mount consists of front limbs from a specimen of the five classes of vertebrates: Mammal (rabbit), Bird (pigeon), Reptile (turtle/lizard), Amphibian (toad/frog) and Fish.
The case is 10.75" long by 8" wide, and 2" high, including the cover. It weighs 1.87 lbs.