The species in Order Grylloblattodea are commonly known as ice crawlers or ice bugs. There are five genera and 34 species within the order. Ice crawlers are about fourteen to thirty millimeters in length and lack wings. They are nocturnal and live in high altitudes or glacial regions. Some can be found in caves. They feed on deceased arthropods, but when that source runs low they will feed on plant material. The eggs are laid in soil or moss and take about a year before the nymph emerges. It takes about five more years to reach maturity. The nymphs will molt five to nine times before becoming adults. Ice crawlers can be seen in the fossil record as far back as the Triassic.
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