Flea beetle (likely)

Vegetation, gardens, crops, and leaf litter; adults may wander indoors accidentally and occur on books or other surfaces.

Adults chew small holes in plant leaves, especially brassicas and other crops; larvae usually feed on roots or below-ground plant parts.

Small, oval beetles that jump powerfully when disturbed using enlarged hind legs. They are most active in warm conditions and overwinter as adults or larvae, depending on species.

Generally harmless to people, pets, books, and buildings. Some species are crop pests, while others contribute to food webs and natural nutrient cycling.