Most millipedes reproduce sexually via internal fertilization. The precise method differs between species and may or may not involve courtship behavior or the use of pheromones.Know More
In millipedes, egg and sperm cells originate in gonopores in the animals' third body segments. Male millipedes have a secondary sexual organ, the gonopod, on the seventh body segment and must transfer sperm from the gonopores to the gonopod prior to copulation.
Male bristly millipedes construct a sort of web on which to deposit sperm. The female picks up the sperm and fertilizes herself. In species with courtship behavior, the male walks on the back of the female to stimulate interest. If the female is receptive, she raises her head region, allowing the male to entwine himself around her. The male deposits sperm into the female reproductive structure via a small packet, or spermatophore. In species that utilize pheromones, the chemicals are likely only effective for short-distance communication. The female lays her eggs in dirt or leaves and, in some species, guards them until they hatch.
Two species of bristly millipede are capable of parthenogenic reproduction. Males are rare or absent in those species, and reproduction is asexual, resulting in young that are essentially clones of the mother.Learn more in Butterflies & Moths
Great white sharks reproduce via internal fertilization, and fertilized eggs are retained in the body until a short while after hatching in a 12-month gestation, after which the young are born live. Prior to birth, the young may eat unfertilized eggs and smaller unborn sharks in the womb. Newborn great white sharks receive no parental care, and swim away immediately after birth.Full Answer >
Japanese spider crabs, also known by their scientific name Macrocheira kaempferi, reproduce by internal fertilization. Once a year, during the mating season between January and March, male crabs insert sperm into abdomens of female crabs with the foremost pair of their chelipeds.Full Answer >
Polar bears reproduce via internal fertilization, with one male mating with several females during the mating season, staying with each for their three-day period of fertility. Mating occurs between late winter and early spring, after which gestation lasts anywhere between 195 and 265 days due to the females' ability to delay fetal development. Litter sizes range from one to four cubs but average two cubs per litter.Full Answer >
Lizards, snakes and toads are a few animals that eat butterflies, according to the TheButterflySite. Frogs eat butterflies as well, and monkeys and rats are two animals in the mammal category that consume butterflies. Humans also eat butterflies as a delicacy in Africa, Southeast Asia and Mexico. Butterflies are consumed by predators as eggs, caterpillars and adults.Full Answer >