Octopuses are carnivores that feed on crabs, clams, squid and fish by catching their prey and then returning to their dens to consume it. A variety of methods are used to extract the edible portion of their prey from a shell, such as pulling it apart with their appendages, using the beaks at the center of their arms to crush it or drilling into the shell and injecting a paralyzing venom into a still-living meal. After an octopus consumes its prey, it will leave the skeletal remains, called "middens," outside its den.
An octopus uses a variety of methods to acquire food, such as chasing and stalking, or in an ambush strategy, emerging suddenly out of a camouflaged location and attacking its prey. Their hunting methods are based on a keen visual sense that also enables them to use their four pairs of arms in well-coordinated movements.
Octopuses are believed to be the most intelligent form of invertebrate life, but the exact extent of their observational learning capabilities is a much-debated topic among biologists. Experiments involving mazes and problem-solving have shown that they possess both long-term and short-term memories. Some laboratory tests have demonstrated that octopuses can be easily trained to differentiate between a variety of patterns and shapes. People who have kept an octopus as a pet have sometimes been surprised to discover that its problem-solving abilities enabled it to escape from its tank and climb into another one to seek food.Learn More
Several animals on the African savannah work together to ensure survival, including baboons with impalas, zebras with wildebeests, oxpeckers with large animals and cattle egrets with buffaloes. Hyenas work together to hunt in packs for the mutual survival of the group, and lionesses hunt in much the same manner as they attempt to bring down zebras, gazelles and wildebeest.Full Answer >
Nineteen of the 20 species of armadillo are native to Latin America, with the other species, the nine-banded armadillo, being native to the United States. Armadillos are considered a threatened species as of 2014.Full Answer >
There are two sets of muscles that help annelids move. One expands, and the other contracts the body. Annelids alternate the use of these muscles to achieve locomotion.Full Answer >
Primary consumers feed solely on plants.Their food consists of leaves, grasses, fungus, flowering shrubs and other hedging plants. In the food chain, plants are the producers that are fed on by herbivores. Examples of primary consumers are cows, goats, antelopes, rabbits, giraffes and zebra.Full Answer >