More than 35 years later, Bdellovibrio biology is undergoing a revival owing to the original, pioneering genetics work of Thomashow and colleagues (13), which has been followed up by genome sequencing and the development of new gene inactivation methods to study the function of these bacteria (32, 42, 60).
They also have five pairs of eyes. The Freshwater Leech is a parasite that feeds on the blood of fish, frogs, turtles, and mammals. It should not be confused with other leeches, most of which prey only on insects, snails, and small creatures.
1 Tiny poison dart frogs may only be one inch (2.5 centimeters) long, but they pack a powerful punchâof poison. 2  Weighing less than an ounce (28 grams), these frogs are considered one of Earth's most toxic, or poisonous, species. 3  For example, the golden poison dart frog has enough poison to kill 20,000 mice. Like all frogs, poison dart frogs are amphibians, a group of animals that includes toads and salamanders. 2  Poison dart frogs eat insects, including flies, crickets, ants, termites, and beetles. 3  A group of frogs is sometimes called an army.