natural defenses

Poisoners and Pretenders

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For many animals, danger lurks in every corner of the rainforest. From brightly colored poison-dart frogs, whose poison is used by hunters to tip their arrows, to snakes and spiders with venomous fangs that inflict instant death, Poisoners and Pretenders shows how nature has provided many of these animals with bright warning colors and camouflaged skin to help protect them from other hungry animals.

Poisoners and Pretenders

Ancient Roman Geography

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The Romans really profited from geography. Rome had a pleasant climate, rich soil, natural defenses, and easy access to the Mediterranean. It was the perfect spot from which to conquer the known world! Learn how Rome used its geographical advantages to launch an empire filled with extensive road and aqueduct systems and towns designed in its own image.

Ancient Roman Geography