Squirrels dig in flower beds in search of young plant bulbs. Perhaps you didn’t bury the bulb deep enough or left the husk on the ground, and the smell attracted a squirrels’ attention. As far as I know, these animals most often eat the bulbs of Colchicum, Tulips, Gladiolus, and Crocuses. However, such flowers as Narcissus, Hyacinth, Galanthus, and Muscari, they prefer not to eat.