The book Nature's Song on Perek Shirah has been out of print for some time. Funds are currently being raised for its republication, but in the meanwhile it is unavailable in stores. However a recent warehouse clean-out unexpectedly turned up a small quantity of books. You can order it online at the ZooTorah website here.
About Perek Shirah:
Perek Shirah, literally "A Chapter Of Song," is an ancient text that is at least a thousand years old; some ancient commentaries even attribute its authorship to King David! It takes the form of a list of eighty-four elements of the natural world, including elements of the sky and of the earth, plants, birds, animals, and insects, attaching a verse from the Bible to each. The concept behind Perek Shirah is that everything in the natural world teaches us a lesson in philosophy or ethics, and the verse gives a clue as to what that lesson is. The result is the "song" of the natural world, the tapestry of lessons for life that the natural world is telling us. Perek Shirah, a work of tremendous historic value, is itself extremely mysterious and cryptic. However, various commentaries have been written on it over the last five hundred years, which give an insight into what the verse is telling us to learn from the creature.
Thus, for example, Perek Shirah states that "The lion is saying, 'God shall go out as a mighty man, he shall arouse zeal, he shall cry, even roar; he shall prevail over his enemies (Isaiah 42:13)." The lion teaches us of the importance of might and power. This does not mean physical strength; true power is power over oneself. All big cats are aggressive predators and therefore cannot get along even with each other; it is only the lion that is able to somehow control its aggression and live in groups. The lion teaches us of the greatest power, that of self-control.
Nature's Song is the first English explanation of Perek Shirah. It makes use of rare ancient commentaries on Perek Shirah , as well as contemporary insights from the fields of meteorology, zoology and so on. The result is a Biblical encyclopedia of the natural world, synthesizing the ancient with the modern, that enables one to perceive new depths of insight into the natural world that surrounds us.