Ecology: Fish Bites Dog

By accident or design, man seems de ermined to upset the delicate balance of nature in Florida. The water hyacinth, imported by a flower lover in 1884, has clogged canals all over the southern end of the peninsula. Clearing operations cost more than $1,000,000 annually. The 30-in. Bufo toad (Bufo marinus), introduced to the Miami area in the 1950s to eat insects, now feeds on the young of native toads, and hundreds of dogs have died after biting into the Bufo's poisonous neck sacks.

The Red-Whiskered Bulbul, a crested Asian visitor freed from...

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