Before there were TV series and even entire channels devoted to the natural wonders of the world, we had books to marvel at. While the copy at Project Gutenberg does not contain images, these are the type of books adolescents in the middle of the previous century will have appreciated when learning more about our little blue planet.
A bewildering array of anecdotes, informative and mostly written without sensationalism. Inevitably some outdated information, but which was deemed accurate at the time. For example, one section uses the caption Suicide March of the Lemmings, perpetuating the myth of self-annihilation, although the word suicide is not used in the text. Also the numbers of animals of a particular species are measured using the counting methods of the time with its inherent error margins.
Also, "at least a half dozen species of plants are man-made" is likely incorrect in the 21st century, but considered special when the book was published, ie 1958.