Animal Reproduction

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.

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  • How many white rhinos are left in the world?

    Q: How many white rhinos are left in the world?

    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.
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  • How long do kangaroos live?

    Q: How long do kangaroos live?

    A: Kangaroos may live anywhere from nine to 22 years on average. The life span of a kangaroo depends on the species and whether the animal lives in the wild or in captivity.
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  • How often do rabbits mate?

    Q: How often do rabbits mate?

    A: Rabbits in the wild mate continuously throughout their breeding season, which lasts from February through September. Female rabbits ovulate after they mate and are considered to be constantly fertile.
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  • How do polar bears reproduce?

    Q: How do polar bears reproduce?

    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.
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  • What is the difference between spay and neuter?

    Q: What is the difference between spay and neuter?

    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.
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  • How long is a giraffe pregnant?

    Q: How long is a giraffe pregnant?

    A: A giraffe is pregnant for about 15 months. During this gestation period, a mother giraffe often returns to the grounds where she was born to birth her own calf.
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  • Which animals migrate?

    Q: Which animals migrate?

    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.
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  • How do peacocks mate?

    Q: How do peacocks mate?

    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.
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  • How do cockroaches reproduce?

    Q: How do cockroaches reproduce?

    A: 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.
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  • What problems are there in hybrid animals?

    Q: What problems are there in hybrid animals?

    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.
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  • Which animals lay eggs?

    Q: Which animals lay 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.
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  • How do parakeets reproduce?

    Q: How do parakeets reproduce?

    A: During parakeet reproduction, the male stands on the back of the female, tucks his tail beneath hers, and rubs their cloaca together to stimulate ejaculation. This process fertilizes the eggs that the female lays.
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  • How do peacocks give birth?

    Q: How do peacocks give birth?

    A: Peacocks do not give birth because they are the males of the species. It is the females, which are called peahens, who give birth by laying eggs.
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  • What are the parts of an egg?

    Q: What are the parts of an egg?

    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.
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  • How many tigers are left in the world?

    Q: How many tigers are left in the world?

    A: As few as 3,200 tigers remain in the world as of March 2014. At the beginning of the 20th century, there were 100,000 tigers worldwide. This means that the number of tigers in the wild has dropped approximately 97 percent in the past century.
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  • What is a baby fox called?

    Q: What is a baby fox called?

    A: A baby fox is called a kit, a pup or a cub, and at birth he resembles a puppy, with a short nose and ears and brown fur. A baby fox grows rapidly and reaches adult size around 6 months of age.
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  • How do snakes reproduce?

    Q: How do snakes reproduce?

    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.
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  • What animal has the biggest brain?

    Q: What animal has the biggest brain?

    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.
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  • What animal has the largest litter?

    Q: What animal has the largest litter?

    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.
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  • What is the cause of phantom pregnancy in dogs?

    Q: What is the cause of phantom pregnancy in dogs?

    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.
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  • How do snails mate?

    Q: How do snails mate?

    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.
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