Links to online resources for teaching about aquatic insects and stream ecosystems
Mayflies - They may live years in the water as immature nymphs, but as adults, they live only one day.
Mayflies underwater (see their gills and how they move around)
Adult Mayflies (flying and depositing eggs on surface of water)
Caddisflies - They collect surrounding materials and build themselves a case. Relatives of butterflies and moths, they undergo complete metamorphosis.