From the back of the book:
The Strange Bestiary is a lavishly illustrated and wildly imaginative collection of 140 creatures encountered on Earth along with those native to the recursions of Ardeyn, Ruk, Crow Hollow, Atom Nocturne, and more. The bestiary also facilitates creating your own worlds by providing scores of creatures that will work in any recursion you can dream up, including those created by fictional leakage and operating under the laws of Magic, Mad Science, and Psionics.
Monument spiders, data sentinels, octopus sapiens, extereons, blobs, kaiju, and killer robots are just the beginning for the diverse and incredibly creative settings of The Strange Bestiary are compatible with Numenera, and most are suitably weird, game masters can also use this book to populate the Ninth World!