It used to be hard to explain “the theory of evolution by Charles Darwin” to the blind students:  they were unable to touch the Darwin Finches to feel the difference of each beak.  With much help from the National Science Museum and the ornithologists, I could make the carvings of 15 finches, and one finch which is supposed to be the common ancestor of them, both male and female.  Understanding that the four kinds of the Ground Finches would be enough to explain the theory, I made the “touch carving” which can be touched to understand my explanation.

Having being made with ornithological accuracy, the students can feel the details of the birds with the fingers.  For instance, Small Ground-finch with small beak eats small seeds, and Large Ground-finch with large beak can eat hard and large ones.  They can get these kinds of important information.
In the class, I also explained that Sharp-beaked Ground-finches, at first, mainly ate seeds and sipped cactus flower nectar.  In the dry season, they learned gradually to pick the ticks on Iguana skin, even to sip the blood of Nazca Booby, and to eat the eggs.  I could let them understand that each species had evolved little by little with the experience.