Once you've seen one firefly...
No, you haven't seen them all. If you observe carefully, you actually might see more than one kind of firefly in your yard. Our fireflies fall into three main groups, which can be differentiated by: * flash color, * flash pattern, and * location.
Firefly (Photos by Emmanuelm at en.wikipedia)  | The Boston Museum of Science's Firefly Watch has an interesting "Virtual Habitat" for fireflies, which illustrates these different colors, patterns, and locations. Check it out!
Our cities and suburbs may be making it difficult for fireflies. For example, * Lawn mowing - During the day, fireflies spend a lot of time on the ground. * Fertilizers and weed killers - Do these have an effect? * Pesticides - Pesticides affect more than just the target insect. Fireflies are not pests, but their larvae are grubs that live in the ground and thus could be affected by pesticides targeting other grubs. * House and building lights - Fireflies find mates by flashing. Does the presence of other lights affect their ability to find a mate? * Streetlights - This kind of light is different from house lights. Do they affect fireflies? * Firefly larvae need a certain amount of moisture to survive. Do they get enough ... or not?
Scientists don't know all the answers to these questions. Most of us (at least we older people), though, know we're seeing a lot fewer fireflies than in years past.
Help scientists find the answers to these questions - answers which might help conserve these magical and beneficial creatures. (Their larvae eat slugs and snails!) Participate in Firefly Watch!
In the meantime, it's not a bad idea--for many reasons--to skip the herbicides and pesticides, reduce turf grass, and perhaps put your security lighting on a motion detector.
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