Signal Crayfish - Pacifastacus leniusulus

When talk about invasive species includes mention of their parasites, stories usually focus on an absence of the later. In fact, when species invade new habitats, one of their biggest advantages is liberation from their usual “bugs.” There are several ways that invasive species escape their parasites, and studies show that relatively few are replaced by parasites native to invaded ecosystems . This means…

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Scientists now believe that scorpions’ fluorescent exoskeletons may help them to find cover during the night. The scorpion’s cyan-green glow can be attributed to two chemicals, noharmane and hymnecromone, that are deposited in the exoskeleton during sclerotization, a biological process by which arthropods are able to harden their exoskeletons. Interestingly, neither young nor recently molted…