Study similarities and differences between animals with these Animal X-Rays. Examine real x-rays printed on heavy-duty scratch-resistant plastic that shows mammals, reptiles, fish, amphibians and birds. Durable construction provides years of use on light tables, overhead projectors and white surfaces. Set includes 14 x-rays, 14 matching picture cards (up to 8" x 10" or 10cm x 25 cm) and a teacher guide. These highly detailed photographs match the animal x-rays. Lay the x-ray over the photograph to see how the skeletal system supports the body of each animal. Set is recommended for children ages 4 and over.