The Australian Cane Toad

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The Australian Cane Toad

THE AUSTRALIAN CANE TOAD
Introduction
The cane toad, Bufo marinus, or giant toad, was introduced to Australia by the sugar cane industry with government sanction, in order to control two specific pests of sugar cane. The grey backed cane beetle and the frenchie beetle. Native to Central and South America, the cane toad has been introduced to several Pacific islands as well. One hundred and one toads arrived at Edmonton in North Queensland in June 1935. About 11 sugar growing locations in northern and central coastal Queensland received authorized shipments. People at Normanton and Burketown, and in northern New South Wales deliberately released the cane toad into the wild. Scientists warned the farmers not to bring the cane toad to Australia but the farmers did not listen and brought them in anyway.
Did the cane toad have any impact on the two cane beetles it was introduced to control? Apparently not. The cane toad ate beetles when they were available, but as a control agent, it had no impact at all. Instead of controlling certain insect populations, the cane toad ate large numbers of bees and other beneficial insects. Within 5 years, an effective insecticide became available and the sugar industry lost interest in the cane toad.
Although not native to Australia, the cane toad has one of the widest ranges of any living toad. The species lives in a wide variety of habitats, but is restricted mainly by the availability of water, since water is a vital element in the breeding cycle. However, toads can survive near very small pools, or steams in arid regions. During the dry or cold seasons, they remain inactive in shallow ground excavations beneath ground cover.
Description
Cane toads are very large and heavily built amphibians (up to 15 cm long) with warty skin. The skin is strong, tough, and durable. Females tend to be larger and smoother-skinned than males. Cane toads are olive-brown to reddish-brown on top, with a paler white or yellowish belly. The underside is usually spotted with brown. The toad is characterized by a stout body, which is heavier than that of frogs.
The most distinctive features of the cane toads are bony ridges over each eye and a pair of enlarged glands, one on each shoulder. These glands are able to ooze venom. A pronounced angular ridge runs between the eyes and snout.
Giant toads can tolerate temperatures of 0 degrees Celsius to 41 degrees Celsius and are able to survive high levels of dehydration. The...

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