Some of the most dangerous spiders in the world include the Brazilian wandering spider, the black widow spider and the brown widow spider. The brown recluse spider, the six-eyed sand spider, the Chilean recluse spider and the northern funnel web spider are also extremely venomous, according to Outdoor Life.
Tadpoles breathe through the gills by moving their throat through regular rhythmic movements, known as pulsing. They can also breathe through lungs, according to Natural History. When they metamorphose into frogs, they eventually lose their gills and start breathing through the lungs or through the skin.
A few examples of insectivores include moles, hedgehogs, moonrots, tenrecs and solenodons. Insectivores are a group of about 450 mammals that eat primarily insects, earthworms and arthropods. Although their name implies that they consume insects, they may also eat plants and other animals, including fish, crustaceans, amphibians, small vertebrates and the eggs of birds.
Some general characteristics of amphibians are that they are cold blooded and spend at least part of their lives in water. Unlike reptiles, they lack claws and their smooth, moist skin is free of scales. Amphibians also lay jelly-covered eggs in a watery medium, whether it's a still pond or the leaves of a water plant like water hyacinth.
There are a number of features that help distinguish male eastern American toads from females of the same species. The most easily identifiable features are size and skin texture.
Amphibians are cold-blooded vertebrates. They have a backbone, and they maintain their body temperature through external means, such as laying in the sun. Amphibians spend part of their lives on water and part of their lives on land. They have permeable skin, which gases and some molecules penetrate; they also have gills for some portion of their lives.
The American alligator is a large, heavily armored reptile armed with sharp claws, a strong tail and an enormously powerful set of jaws lined with conical teeth. As apex predators, alligators have no natural enemies but can rely on these features for defense.
Cockroaches reproduce by mating. When sperm from the male is introduced to the female's eggs, an egg sac called an ootheca is produced. The number of eggs the ootheca holds varies by species.
During the mating season, the male peacocks use their colorful feathers to attract the female peahens. The males use their feathers to form a large train that is then maneuvered in courtship displays. The peahens choose peacocks depending on the color, size and quality of the feather trains.
There are a number of behavioral signs that a dog is ready to give birth, including a loss of appetite and restlessness. A pregnant dog will lose interest in food about 24 hours before delivering her puppies, according to PetMD.
According to Goat World, a baby goat is called a kid. A kid is considered any baby goat under 6 months of age. The term is used for both male and female goats.
On an individual level, hybrid animals sometimes have reproductive, health or behavioral issues due to their genetics. Ecologically, hybrids blur the lines of species and pose problems for conservation.
The sperm whale is the animal with the largest brain, which weighs about 18 pounds. The mature adult brain of the sperm whale can grow to a size of approximately 500 cubic inches. Its brain mass is only 0.02 percent of its entire body mass.
It is illegal to own a falcon in the United States without the proper state and federal licenses. To obtain these permits, an aspiring falconer must apprentice under a sponsor for at least two years and pass a written examination. Once this is complete, and an inspection has been made of the facilities where the bird will be kept, a person can legally acquire a falcon.
Birds mate by rubbing their cloaca together in what scientists call a cloacal kiss. Birds of both sexes have a cloaca, which is an opening that swells and sticks out of the body slightly during mating season.
To fix a bird's broken leg, wrap the leg in several layers of medical tape, and leave the tape until the fracture sets. You need a pair of scissors, a roll of porous medical tape, a roll of waterproof medical tape and a curved hemostat.
In the wild, ostriches have demonstrated top running speeds of more than 40 mph, according to the National Wildlife Federation. The ostrich is the largest bird in the world and relies on its speed in order to outrun predators.
According to About.com, fish are one of the most common foods ducks eat. Ducks also typically feed on snails, worms, crustaceans, grasses, weeds, aquatic plants, small amphibians, insects, seeds, fruits and nuts. Ducks are omnivores, but their diets vary for several reasons.
Peregrine falcons are found on every continent in the world, with the exception of Antarctica. The birds also inhabit ocean islands across the globe. They nest in a variety of settings.
A cricket can typically live from three to 12 months. This varies from species to species. However, the three life stages of a cricket may encompass more than one year, with most of the time spent as an unhatched egg that remains dormant during the winter.
The fastest insect known to man is a species of Australian tiger beetle known as Cicindela hudsoni, which was recorded at 5.6 miles per hour. The next fastest is another Australian tiger beetle, Cicindela eburneola, which was observed in the same study to have a top speed of 4.2 miles per hour.
According to Orkin, stink bugs do not typically bite people. Even so, they are often considered pests because they feed on both ornamental plants, garden produce and crops. In addition, they sometimes find shelter inside houses for the winter, living inside walls or crawl spaces.
The Giant Asian praying mantis, also known as Hierodula membranacea, is a large winged insect of the mantidae animal family. Males can grow to be 3 inches long, whereas females can reach closer to 3.5 inches. The reference to praying in the mantis' name describes the positioning of the front limbs on the insect, rather than the carnivorous characteristics of the animal.
Mother Earth News suggests using a trap made from a 2-liter soda bottle to kill mosquitoes. It's typically easier to deter mosquitoes and other pests rather than kill them.
While they are willing to feed on anyone, mosquitoes do have a preference for who they bite. Mosquitoes prefer people who have type O blood over those with any other type.