A report on Penis

Mallard pseudo-penis
Females have corkscrew vaginas with many blind pockets designed for difficult penetration and to prevent becoming pregnant. This reduced the likelihood of fertilization by unwanted aggressors in favor of fitter mates.
External male genitalia of a Labrador Retriever
Penises of minke whales on display at the Icelandic Phallological Museum
Genitorinary system of a raccoon (Procyon lotor)
Penis of a human, with pubic hair removed to show anatomical detail
The spine-covered penis of Callosobruchus analis, a bean weevil

Primary sexual organ that male animals use to inseminate females (or hermaphrodites) during copulation.

- Penis
Mallard pseudo-penis

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Glans

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The glans (, plural "glandes" ; from the Latin word for "acorn") is a vascular structure located at the tip of the penis in male mammals or a homologous genital structure of the clitoris in female mammals.

The dried tip of a Blue whale penis, Icelandic Phallological Museum, Reykjavík, Iceland

Blue whale penis

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The blue whale has the largest penis in the animal kingdom.

The blue whale has the largest penis in the animal kingdom.

The dried tip of a Blue whale penis, Icelandic Phallological Museum, Reykjavík, Iceland
Blue whale

"Average" for a blue whale penis, however, is difficult to gauge given that the penis is unlikely to be able to be measured during sexual intercourse.

Tinamou

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Order of birds called Tinamiformes, comprising a single family called Tinamidae , divided into two distinct subfamilies, containing 46 species found in Mexico, Central America, and South America.

Order of birds called Tinamiformes, comprising a single family called Tinamidae , divided into two distinct subfamilies, containing 46 species found in Mexico, Central America, and South America.

The moas Dinornis robustus and Pachyornis elephantopus, tinamous' extinct ratite cousins from New Zealand
Great tinamou
Hooded tinamou
Cinereous tinamou
Red-winged tinamou
Brushland tinamou
White-bellied nothura
Patagonian tinamou
Ventral view of the cranium of a red-winged tinamou
Elegant crested tinamou – one of the crested species
Darwin's nothura occupies high altitude grasslands
Slaty-breasted tinamous are found in tropical lowland forests
Many of the larger tinamous, like this great tinamou roost in trees at night.
Puna tinamou group
The variegated tinamou has an asymmetrical sex ratio, with more females than males
Juvenile undulated tinamou in captivity
Tayras prey on tropical forest tinamous.
Chilean tinamous have been introduced to Easter Island.
The small-billed tinamou has been considered a suitable candidate for domestication
The solitary tinamou is listed under CITES
Dwarf tinamous have been badly affected by pastoral management
Spotted nothuras are still extensively hunted.

The male has a corkscrew shaped penis, similar to those of the other ratites and to the hemipenis of some reptiles.

A 1927 drawing of chimpanzees, a gibbon (top right) and two orangutans (center and bottom center): The chimpanzee in the upper left is brachiating; the orangutan at the bottom center is knuckle-walking.

Primate

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Primates are a diverse order of mammals.

Primates are a diverse order of mammals.

A 1927 drawing of chimpanzees, a gibbon (top right) and two orangutans (center and bottom center): The chimpanzee in the upper left is brachiating; the orangutan at the bottom center is knuckle-walking.
Homo sapiens is the only living primate species that is fully bipedal.
Nilgiri langur (Trachypithecus johnii), an Old World monkey
Common brown lemur, a Strepsirrhine primate
Emperor tamarin, a New World monkey
Primate skulls showing postorbital bar, and increasing brain sizes
An 1893 drawing of the hands and feet of various primates
Vervet hindfoot showing fingerprint ridges on the sole
Distinct sexual size dimorphism can be seen between the male and female mountain gorilla.
Diademed sifaka, a lemur that is a vertical clinger and leaper
The tapetum lucidum of a northern greater galago, typical of prosimians, reflects the light of the photographer's flash
A social huddle of ring-tailed lemurs. The two individuals on the right exposing their white ventral surface are sunning themselves.
Chimpanzees are social great apes.
A crab-eating macaque breastfeeding her baby
Leaf eating mantled guereza, a species of black-and-white colobus
A mouse lemur holds a cut piece of fruit in its hands and eats
Humans have traditionally hunted prey for subsistence.
A western lowland gorilla using a stick possibly to gauge the depth of water
Crab-eating macaques with stone tools
Rhesus macaque at Agra Fort, India
Slow lorises are popular in the exotic pet trade, which threatens wild populations.
Sam, a rhesus macaque, was flown into space by NASA in 1959.
Humans are known to hunt other primates for food, so-called bushmeat. Pictured are two men who have killed a number of silky sifaka and white-headed brown lemurs.
The critically endangered silky sifaka
The critically endangered Sumatran orangutan

Male primates have a pendulous penis and scrotal testes.

Beech marten

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Species of marten native to much of Europe and Central Asia, though it has established a feral population in North America.

Species of marten native to much of Europe and Central Asia, though it has established a feral population in North America.

Skull, as illustrated in Merriam's Synopsis of the weasels of North America
Various throat patch variations, as illustrated in
Skull of a beech marten
A litter of beech marten kits in а farm outbuilding in the village of Orlintzi, Bulgaria
Beech marten fighting a European otter, as illustrated in Brehm's Life of Animals

The beech marten's penis is larger than the pine marten's, with the bacula of young beech martens often outsizing those of old pine martens.

Dromedary

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Large even-toed ungulate, of the genus Camelus, with one hump on its back.

Large even-toed ungulate, of the genus Camelus, with one hump on its back.

This camel has thick, double-layered eyelashes and bushy eyebrows (Algeria)
The dromedary has a long curved neck, single hump and long hair on the throat, shoulders and hump
Dromedary heart
A dromedary skull
Camel kidney (longitudinal cut)
Herd of dromedaries in the Negev, Israel
"Lion Attacking a Dromedary," a 19th century taxidermy diorama by Jules and Édouard Verreaux.
Dromedaries are primarily browsers
Footprint in dry sand
Mating
Calf suckling
A pair of camels and calf in Israel
A dromedary in outback Australia, near Silverton, New South Wales, Australia. Feral dromedaries are only found in Australia.
Dromedaries at Bait al-Faqih Market, Yemen
A camel decorated for a tourist camel ride in the Judean Desert
Dromedary being milked in Niger
Meat of dromedary served as food
Camel slaughter in Mauritania

The penis is covered by a triangular penile sheath that opens backwards; it is about 60 cm long.

American mink

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Semiaquatic species of mustelid native to North America, though human intervention has expanded its range to many parts of Europe, Asia and South America.

Semiaquatic species of mustelid native to North America, though human intervention has expanded its range to many parts of Europe, Asia and South America.

Skeleton of an American mink from the Muséum national d'histoire naturelle
Skull, as illustrated by N. N. Kondakov
American mink with porcupine quills in its face. Yarmouth, NS
An juvenile American mink.
American mink paws, as illustrated by Ernest Thompson Seton
Southern mink (N. v. vulgivagus) in a threatening posture
American mink emerges from a pond
American mink in a burrow
American mink kits
American mink with fish, in Norway
An American mink in Lithuania's Kėdainiai district
Illustration of an American mink approaching a board or log trap
Various American mink colour mutations
Mink as pet

The adult male's penis is 5.6 cm long, and is covered by a sheath.

Preputial mucosa

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The preputial mucosa of the penis is the epithelium of the inside of the prepuce, or foreskin.

Lower Parts of the Genital and Urinary Tracts in the Male

Corpus spongiosum (penis)

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Lower Parts of the Genital and Urinary Tracts in the Male
Structure of the penis
The penis in transverse section, showing the blood vessels.
Diagram of the arteries of the penis.
Vertical section of bladder, penis, and urethra.
Cross section of penis
Transverse section of the penis.
The constituent cavernous cylinders of the penis.
Medical ultrasonography of a normal penis.

The corpus spongiosum is the mass of spongy tissue surrounding the male urethra within the penis.

Martin van Maële's print Francion 15

Sexual arousal

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Sexual arousal (also known as sexual excitement) describes the physiological and psychological responses in preparation for sexual intercourse or when exposed to sexual stimuli.

Sexual arousal (also known as sexual excitement) describes the physiological and psychological responses in preparation for sexual intercourse or when exposed to sexual stimuli.

Martin van Maële's print Francion 15
Two birds that appear to be exhibiting affection

The ring surrounds the penis, but does not constrict or cause discomfort.