Fireflies tend to be brown and soft-bodied, often with the elytra, or front wings, more leathery than those of other beetles.
Although the females of some species are similar in appearance to males, larviform females are found in many other firefly species. These females can often be distinguished from the larvae only because they have compound eyes. The most commonly known fireflies are nocturnal, although there are numerous species that are diurnal. Most diurnal species are not luminescent; however, some species that remain in shadowy areas may produce light.
Light production in fireflies is due to a type of chemical reaction called bioluminescence. This process occurs in specialized light-emitting organs, usually on a firefly's lower abdomen. The enzyme luciferase acts on the luciferin, in the presence of magnesium ions, ATP, and oxygen to produce light. Gene coding for these substances have been inserted into many different organisms. Firefly luciferase is used in forensics, and the enzyme has medical uses - in particular, for detecting the presence of ATP or magnesium. It has been speculated that Baroque painter Caravaggio may have prepared his canvases with a powder of dried fireflies to create a photosensitive surface on which he projected the image to be painted.
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You'll note (as soon as you load some images into the builder) that all images are automatically downsized to a maxim width of 999px. That width is what's required by the space that's available for the banner on each page. For the slideshow to be "nice" looking, all images should have the same width and height; the downsizing will maintain the correct aspect ratio.