So Many Hydra

This video shows what collected on my black tray while it was left on a stool in my backyard over a period of 2 days. The number of hydrae is shocking.
During 2022 - 2023 I would occasionally see a hydra, or two while using the microscope but this has changed and now the of hydrae in the environment has exploded.
I believe the tiny yellow balls are hydra eggs.
Hydra are supposed to live in water, but I have found them in my household dust, spider webs, the soil, on tree bark, rock particles, the dust collected on the tray after leaving it outside for 2 days, and the dust I collected from the air vents in my brother's truck. My brother lives 2 hours (100 miles) from where I live. None of the things or places I just listed are in water so these hydra are obviously not where they belong.
Hydra are immortal and are a main focus in stem cell research.
Hydra fully regenerate when damaged so if 1 hydra is cut into 2 pieces, both halves will regenerate and become 2 hydrae.