Question

The very fine blood capillaries in bats wings were discovered by?

Answer 1

A scientist could see very tiny blood vessels in the wings of bats. These tiny blood capillaries help in heat dispersal in bats. Blood capillaries are the smallest blood vessels that form a junction between arteries and veins that is a connection between oxygenated and non-oxygenated blood.

Complete answer:
The theory of evolution by survival, first formulated in Charles Darwin's book "On the Origin of Species" in 1859, describes how organisms evolve over generations through the inheritance of physical or behavioral traits. Darwin took example of beak shapes in the Galapagos finches to explain his Theory of Evolution. Individuals with traits that allow them to adapt to their environments will help them survive and have more offspring, which can inherit those traits. Individuals with less adaptive traits will less frequently survive to pass them on. Over time, the traits that allow species to survive and reproduce will become more frequent within the population and therefore the population will change, or evolve. With the help of natural selection, Darwin suggested, a diverse life-forms could arise from a common ancestor.
Bats belong to Chiroptera order and are capable of flying and have excellent night vision. All bats have a generally similar appearance on the wing. Facial appearance is dominated by the muzzle and ears. Bats are particularly abundant in the tropics. Bats are mammals that have front limbs specialized for flying. The hips and legs are thin, as they do not most of the time support any body weight. The wings shape is governed by the relative lengths of the forearm and the fingers, Bats can raise or lower their body temperature to that of their surroundings. This process is known as heterothermy. The blood vessels help in heat dissipation in bats that further helps in controlling their body temperature.

Note:
Bat blood has smaller RBCs than normally found in other mammals and a larger number of RBCs within the same circulating blood volume. These smaller cells also provide a comparatively larger area for gas exchange to occur. The actual mechanism of bat circulation remains not completely understood.