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.
A: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.
A:According to PetMD, phantom pregnancy in dogs, also known as false pregnancy or pseudopregnancy, is most likely caused by hormonal imbalances, especially of progesterone and prolactin. The female dog starts showing pregnancy symptoms or begins lactating within a month or two after her latest heat cycle (estrus) concludes.
A:According to About.com, most land snails are hermaphrodites. Following courtship in early summer, a pair of snails inseminate each other through a reproductive opening located near the front of the body, resulting in fertilized eggs.
A:Birds lay eggs, although there are other egg-laying animals, including two mammals: the duckbill platypus and the echidna. These two creatures are natives of Australia. Scientists call these primitive egg-laying mammals monotremes.
A:Most fish breed by spawning, or laying eggs, according to Petalia. Some fish species give birth to live babies. Spawning fish reproduce when males fertilize the eggs after they are laid, while livebearing females are directly fertilized by the males.
A:The parts of an egg include the shell, the inner and outer membranes, the air cell, the albumen, the chalazae, the vitelline membrane, the yolk and the germinal disc. The shell is hard and porous and serves as a protective layer that allows gases to be transferred in and out of the egg.
A: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.
A:According to the National Wildlife Federation, the animals that eat lemurs are primarily fossa, which is a relative of the mongoose that lives in Madagascar. However, recently humans have also started to eat lemurs, due mostly to poverty.
A: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.
A: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. Billy is also a name used for a male goat.
A:Some snakes reproduce by laying eggs while other species give birth to live young. How snakes reproduce depends on the species and also the location. In cooler regions of the world, snakes reproduce only in spring and summer, while in warm regions they may reproduce all year long.
A:There are few observable traits distinguishing migrating animals from non-migratory species. Many birds, such as Arctic terns, mallards and bar-tailed godwits migrate across vast distances, while some of their close relatives remain in the same place all year. There are species of birds, fish, mammals, and even reptiles and amphibians that migrate each year.
A:Spaying and neutering are both procedures used to sterilize animals like dogs and cats, but spaying refers to the procedure done to female animals while neutering is the corresponding process for males. Spaying involves taking out the uterus and ovaries while male pets are neutered by taking out the testicles.
A:Depending on the species, insects may reproduce either sexually or asexually. Sexual reproduction requires one egg from a female and a sperm from a male. The sperm fertilizes the egg, which resides in the female through its term to hatch insects when the growth and development stage is complete.
A: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.
A: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.
A:According to the World Wildlife Fund, there are more than 20,000 southern white rhinos in the world, but only four northern white rhinos, as of 2014. The majority of these two subspecies, which are genetically different, live in South Africa, Namibia, Zimbabwe and Kenya.
A:The common tenrec — a hedgehog-like creature from Madagascar — produces the largest litters among mammals. The average litter of this small animal includes approximately 18 young, but litters up to 32 have been recorded. Tiger snakes also produce very large litters; the largest ever recorded contained 126 baby snakes.