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Washington Island is approximately 2 mi (3.2 km) long and 0.5 mi (0.80 km) wide. Like the rest of the Isle Royale archipelago, the island is an ancient ridge of basalt oriented from the southwest to the northeast. [1] Washington Island is separated by Grace Harbor from Isle Royale.
The oriental cockroach (Blatta orientalis), also known as the waterbug (as they live in damp areas) or black cockroach (as their bodies are mostly dark), [1] is a large species of cockroach, adult males being 18–29 mm (23 ⁄ 32 – 1 + 5 ⁄ 32 in) and adult females being 20–27 mm (25 ⁄ 32 – 1 + 1 ⁄ 16 in). [2]
Immature cockroaches emerge from egg cases in 6–8 weeks and require 6–12 months to mature. After hatching, the nymphs feed and undergo a series of 13 moultings (or ecdysis). Adult cockroaches can live up to an additional year, during which females produce an average of 150 young. The American cockroach reproductive cycle can last up to 600 ...
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While cockroaches do, indeed, have a much higher radiation resistance than vertebrates, with a lethal dose perhaps six to 15 times that for humans, they are not exceptionally radiation-resistant compared to other insects, such as the fruit fly. [67] The cockroach's ability to withstand radiation has been explained through the cell cycle.
Both sexes of L. verrucosa have short wings but dwell on the ground and are reluctant to fly. It is mainly nocturnal and hides during the day. It is mainly nocturnal and hides during the day. It is ovoviviparous , the female giving birth to about twenty dark-coloured nymphs 2 to 3 millimetres (0.079 to 0.118 in) long.
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Nymphs turn a dark brown, and the common name "six spotted cockroach" refers to six yellow spots along the sides of the nymph. Adults of both genders have wings but do not fly. They grow to approximately 6.4 cm (2.5 in) in length. Males are generally smaller than females, with longer wings, and a small rear sternite compared to females.