Kneazles are very smart creatures.
They also have a very long lifespan. Scamander was quite fond of these interesting little creatures, especially in his later years when his physical reactions had slowed down, making the assistance of such creatures essential during his interactions with magical beasts. They could sense the emotions of unfamiliar magical creatures—whether they were friendly or hostile, dangerous or safe—and even help soothe them.
Everyone in the house was drawn to their unusual behavior.
Chapter 380