DrosophilaDrosophila (/drəˈsɒfɪlə, drɒ-, droʊ-/) is a genus of flies, belonging to the family Drosophilidae, whose members are often called "small fruit flies" or (less frequently) pomace flies, vinegar flies, or wine flies, a reference to the characteristic of many species to linger around overripe or rotting fruit.https://en.wikipedia.org › wiki › Drosophila
Asian elephant sperm measures about 56 micrometers (0.002 inches), while mouse sperm is about 124 micrometers (0.005 inches). Although mouse sperm is much larger, mice only release 9.5 million of them — compared to more than 200 billion sperm ejaculated by an elephant.
The largest sperm ever discovered belongs to a species of fruit fly, Drosophila bifurca, that has sperm over 2 inches in length - over 20 times their body size! Scientists have found the world's oldest sperm, frozen in time inside of fossilized ostracods, tiny crustaceans also sometimes known as seed shrimp.
In mammals, the house mouse (Mus musculus) has the longest sperm relative to its body weight; the Asian elephant has the shortest sperm, similar in size to human sperm.
Amazing, whales have some of the smallest sperm of all mammals. They vary from 50-75 microns, whereas human sperm are 40-90 microns long. It is thought that whales have such small sperm because the female reproductive tract is so large that having longer sperm doesn't give a male any extra advantage.
The larger the animal, the more important the number of sperm is relative to sperm length. That's why elephants have smaller sperm than mice. In the animal world, if several males mate with the same female, their sperm compete to fertilize her limited supply of eggs.
Could we mate with other animals today? Probably not. Ethical considerations preclude definitive research on the subject, but it's safe to say that human DNA has become so different from that of other animals that interbreeding would likely be impossible.
The tuberous bush cricket wrests the record for largest testes in relation to body weight from a tiny species of fruit fly, Drosophila bifurca, whose testes account for 10.6% of its bodyweight.
Sperm cells are really, really small….
In fact, they are some of the smallest cells in the human body, and measure just 0.005cm.
The lightest weight of testis measured was 0.7kg. and the heaviest was 13.5 kg. And, the lightest weight of sampled testes was 0.8 kg. and the heaviest was 8.7kg.
Of the 90 known whale species on Earth, sperm whales are the only species with throats large enough to technically swallow a human. The 65-foot-long mammals have large esophaguses to feed on larger prey such as giant squid, which they sometimes swallow whole.
Naturally, a human cannot impregnate a pig as there are many reproduction barriers between them. Naturally different species cannot breed as there are many reproduction barriers most importantly there are genetic barriers.
Sperm length varies by several orders of magnitude across species, from the tiny sperm of the porcupine (0.0003 cm) to the gigantic sperm of the fruit fly (6 cm), which is more than 20 times the length of the fly.
The Patient Pachyderm
Elephants are the largest land mammals in the world, so it's perhaps not surprising that they have the longest pregnancy of any living mammal: African elephants are pregnant for an average of 22 months, whilst for Asian elephants it's 18 to 22 months.
When sperm are inside women's body, they can live for up to 5 days. If you're a man and you have sex even a few days before your partner ovulates, there's chance they may get pregnant.
For example, human semen, particularly dried semen, happens to be a favorite of flies. If enough is made available, they will eat it until it kills them. Blood, although considered a viable source of food, is less desirable, but it can still easily be transferred to a crime scene through fly fecal matter or vomit.
Ejaculates with a higher number of motile sperm cells are more likely to fertilize an egg and lead to pregnancy. 'Super Sperm' is an unofficial term we've given to samples with a very high total motile sperm count.
Most animals that procreate through parthenogenesis are small invertebrates such as bees, wasps, ants, and aphids, which can alternate between sexual and asexual reproduction. Parthenogenesis has been observed in more than 80 vertebrate species, about half of which are fish or lizards.
There is no specific frequency with which a man should ejaculate. There is no solid evidence that failure to ejaculate causes health problems. However, ejaculating frequently can reduce the man's risk of getting prostate cancer. Ejacu-lation can be through having sex or masturbating a few times a day.
They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm.
Normal sperm densities range from 15 million to greater than 200 million sperm per milliliter of semen. You are considered to have a low sperm count if you have fewer than 15 million sperm per milliliter or less than 39 million sperm total per ejaculate.
Your testicle is an oval-shaped, sperm-producing organ within your scrotum. The average length of a testicle is between 4.5 to 5.1 centimeters (about 1.8 to 2 inches). Testicles that are less than 3.5 centimeters (about 1.4 inches) long are considered small.
The largest testes of any animal species are those of the right whale (genus Eubalaena), each of which may weigh as much as 500 kg (11,000 lb) and produce as much as 4.5 litres (1.2 US gallons) of sperm. Female right whales have been observed to engage in simultaneous copulations with males.
Wesley Warren, 49, spent more than four years with this extra burden before having surgery to repair the damage from a rare medical condition called scrotal lymphedema.
The pregnancy would not survive. The sperm and egg of different species are incompatible. Technically a pregnancy may begin, but will soon spontaneously terminate. A human has 46 chromosomes with the male and female each contributing 23 chromosomes to their offspring.