The book "Animal Intelligence. International Scientific Series, Volume XLIV" by George John Romanes is one of the key works devoted to the study of animal intelligence. In this edition, the author systematically analyzes various aspects of intelligence in different species of animals, from the simplest to the most complex. Romanes examines perception, learning, memory, problem solving, behavior in complex situations, and much more related to animal intelligence. The book is a valuable resource for anyone interested in animal psychology and behavior, and represents an important contribution to the study of the nature of intelligence in general.