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Insects that glow and sing

Across
Hardened front wings of beetles that cover and protect the back wings
Protective layer or shell of some plants and animals
Change in order to adjust to new conditions
Light given off by some plants and animals, such as fireflies, caused by a biochemical reaction
Thin skins that help produce sounds in some insects
The front legs of a four-legged animal
Down
Lights that have a covering, usually made of glass
The close resemblance of one plant or animal to another, often serving a protective purpose
A clear material that allows objects behind it to be seen
Insects known for their tough outer coverings, including hardened forewings