The video explores Darwin's finches and their role in developing the theory of evolution by natural selection. Darwin's observations of finch variations on the Galapagos Islands led to the idea that species adapt to their environments over time. These findings were crucial in forming the theory of natural selection, which explains the diversity of life on Earth. The video concludes by encouraging further exploration of ongoing evolution in these birds.

What is the theory proposed by Darwin that explains how species evolve over time?

In what year did Darwin publish his book 'On the Origin of Species'?