SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM is an educational science book for children, youth, schools, libraries, and anyone interested in animals. Learn about the similarities and differences between 25 sets of animals.

What are the similarities and differences between alligators and crocodiles? Which one has a U-shaped snout, and which one has a V-shaped snout? What are the similarities and differences fleas and ticks? Which one is not an insect? Are wallabies just small kangaroos? Emus and ostriches are similar because they can’t fly, but they have different feet. Which one has two toes and which one has three toes? Salmon and tuna have different tails, whereas octopuses and squids have the same number of hearts.

Butterflies and moths have different antennae. Which one has club-shaped antennae and which one has feathery antennae? Can cheetahs or leopards climb trees, and which one can’t roar? Do dolphins and porpoises have similar dorsal fins? Do foxes and wolves have more similarities or more differences? SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM has the answers!

This intriguing look at the animal kingdom provides FAST FACTS with an instant list of the main similarities and difference between each pair of animals, as well as their scientific classifications, descriptions, habitats, diets, breeding habits, and much more. There are interesting facts, fallacies, phrases, singular and plural animal words, collective nouns, and a glossary of scientific terms.

The 25 sets of animals include:

Alligators and Crocodiles Falcons and Hawks
Ants and Termites Fleas and Ticks
Bees and Wasps Foxes and Wolves
Butterflies and Moths Frogs and Toads
Centipedes and Millipedes Gophers and Hamsters
Cheetahs and Leopards Hares and Rabbits
Dingoes and Dogs Herons and Storks
Dolphins and Porpoises Kangaroos and Wallabies
Ducks and Geese Lizards and Snakes
Donkeys and Mules Octopuses and Squids
Echidnas and Hedgehogs Salmon and Tuna
Eels and Sea Snakes Tortoises and Turtles
Emus and Ostriches


Now available on Kindle




     Similar but Different in the Animal Kingdom is a delightful and informative book that introduces students not only to the basics of zoology, but to the nuanced distinctions of classification. Ranging from physiological differences to dietary and habitudinal differences, the book lays out a cogent system that teaches children how to compare and contrast seemingly similar animals in such a way as to understand their unique place in the natural world, their life cycle, survival, and larger role in their respective ecosystem. While Similar but Different in the Animal Kingdom is detailed and deeply scientific, author Martina Nicolls’ prose makes each lesson easily accessible to students, presenting a straightforward glossary of terms coupled with a blended colloquial/academic diction that helps to break down these complicated subjects. Perfect for the classroom or at home, Similar but Different in the Animal Kingdom is sure to spark children’s interest in zoology and teach them the essential skill of classification in a fun and rigorous way. I highly recommend this book.

Charles Asher, PBK Reviews – Phi Beta Kappa

SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM (ISBN: 978-1-68181-941-9) is now available for $34.50 and can be ordered through the publisher’s website: or at or

WHOLESALERS: This book is distributed by Ingram Books and other wholesale distributors. Contact your representative with the ISBN for purchase. Wholesale purchase for retailers, universities, libraries, and other organizations is also available at a discounted price through the publisher at the email

 Cover-Animal Book



Do you have ideas for future sets of animals that you would like to see in the second book of SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM? If so, write to me here. I am looking forward to your ideas.