In the natural world, there are some creatures which give forth light from the inside of their body.
Besides the wellknown firefly and noctilucas, a kinds of squid, snail, mushroom and bacterium emit light.
Fireflies and Watasenia scintillans, a kind of squid, make the emission in their body, on the other hand, Cypridina hilgendorfii, a kind of Crustacea, gives off luminous liquid from the inside of their body.
These are some ways for these creatures to emit light.
There are several reasons for them to emit light, danger, communication, and others, but all of the reasons are not yet fully understood.
|