CC0 Usage Conditions ApplyClick for more information. For six weeks, luna moth caterpillars gorge themselves on the leaves of the marula tree. Then, when they're ready, they instinctively weave giant ...
CC0 Usage Conditions ApplyClick for more information. Smithsonian marine biologists Kim Holzer and Jenny Carney sample ballast water from a bulk cargo ship in Virginia. Large ships take on ballast ...
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