This video explores the fascinating world of freshwater macroinvertebrates. Tiny water creatures visible to the naked eye, like dragonfly nymphs, crayfish, and worms. Living in streams, rivers, and ponds, they act as janitors of freshwater, indicating water quality, supporting the food chain, and keeping ecosystems healthy. We show how to collect and identify them using simple tools, assess water quality, and understand their crucial role. Finally, the video emphasizes our responsibility to protect water resources through pollution prevention, conservation, and mindful practices, ensuring a sustainable future for all living beings.