One of the many challenges facing those taking up Aristotle’s zoological writings, or more generally even such works as his “Physics,” is that of understanding the very different scope of his explorations and explanations from what such would be were they to have been undertaken by a modern writer. Indeed, even the very word “physics” (from the Greek φύσις) itself had a very different meaning to Aristotle and his contemporaries than how we use the word today.
Doing any serious research into, or writing about, the life and work of Charles Darwin can be an overwhelming endeavor. After all, between all the books he wrote, all the discoveries he made, all the people with whom he corresponded, all the species named in his honor, and of course, all the kerfuffles that arose as a result of his work, just locating exactly what you might be seeking can be a seemingly daunting task to say the least.