Springtails (likely)

Moist soil, leaf litter, decaying wood, compost, and damp building surfaces. The clustered debris suggests a humid, organic-rich microhabitat.

Fungi, algae, bacteria, decaying plant matter, and other microorganisms; they do not typically bite or feed on people.

Often occur in dense groups and increase rapidly under damp conditions. Many species jump using a forked abdominal springing organ called a furcula.

Harmless to humans, pets, and structures, though large indoor numbers indicate excess moisture. They recycle organic matter and help regulate fungi and microbial communities.