What are some interesting facts about water spiders?

The spider will spin the web on the water surface and collect air bubbles to fill it from underneath.  The spider can then pop up under its web and breathe when it needs to.  These spiders also mate and lay their eggs in the ‘air bubble web’.

Water spiders are generally nocturnal animals that feed at night.
Water spiders eat things like tadpoles and other small aquatic invertebrates.

Water spiders hibernate during the colder months. To do this, they build an "air bell," a series of webbing that traps air for the spider to breathe. Before hibernating, the spiders will close up the air bell by lining it with silk.