: Alex learned more than 100 English words and could use them creatively to label objects, colors, shapes, and materials.
: He understood complex ideas like "same" vs. "different," "bigger" vs. "smaller," and even grasped a zero-like concept .
is a critically acclaimed memoir by psychologist Irene M. Pepperberg that chronicles her thirty-year scientific journey and deep emotional bond with Alex , an African Grey parrot. The book, a New York Times bestseller, explores how their work together revolutionized the scientific understanding of animal intelligence and language. Key Scientific Achievements