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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Lake duck

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Small, South American stiff-tailed duck.

Small, South American stiff-tailed duck.

Females
Female ducks have an anti-corkscrew vagina made for difficult penetration.

The lake duck holds the Guinness World Record for having the largest avian reproductive organ, from a specimen in Córdoba, Argentina that had a penis measuring 42.5 cm. It also has the longest penis of any vertebrate in relation to body length.

A bottlenose dolphin

Dolphin

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Aquatic mammal within the infraorder Cetacea.

Aquatic mammal within the infraorder Cetacea.

A bottlenose dolphin
Dolphins display convergent evolution with fish and aquatic reptiles.
The anatomy of a dolphin showing its skeleton, major organs, tail and body shape.
Biosonar by cetaceans.
Diagram illustrating sound generation, propagation and reception in a toothed whale. Outgoing sounds are in cyan and incoming ones are in green
The face of a common bottlenose dolphin
A pod of Indo-Pacific bottlenose dolphins in the Red Sea
Dolphins surfing at Snapper Rocks, Queensland, Australia
A skin-skeletal preparation.
Sleeping dolphin in captivity: a tail kick reflex keeps the dolphin's blowhole above the water.
Spectrogram of dolphin vocalizations. Whistles, whines, and clicks are visible as upside down V's, horizontal striations, and vertical lines, respectively.
Pacific white-sided dolphins porpoising.
Lesions in the dorsal fin of a bottlenose dolphin caused by lobomycosis, a fungal infection of the skin.
Dead Atlantic white-sided dolphins in Hvalba on the Faroe Islands, killed in a drive hunt.
Fresco of dolphins, c. 1600 BC, from Knossos, Crete.
Silver stater from Tarentum c. 290 BC showing Phalanthos riding a dolphin on one side and a rider with a shield decorated with a dolphin on the other side.
Vessel in form of orca, Nazca culture, circa 200 AD. American Museum of Natural History collections.
SeaWorld show featuring bottlenose dolphins and pilot whales.
SeaWorld San Diego pilot whale with trainers.
Shamu in 2009, with a collapsed dorsal fin.
A military dolphin.
Plate of dolphin sashimi.

Males have two slits, one concealing the penis and one further behind for the anus.

A model of a skeleton of a blue whale, the largest animal on earth

Largest body part

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Either the largest given body part across all living and extinct organisms or the largest example of a body part within an existing species.

Either the largest given body part across all living and extinct organisms or the largest example of a body part within an existing species.

A model of a skeleton of a blue whale, the largest animal on earth
Blue Whale penis
Giraffes are instantly recognisable for their long necks.
The femur is the longest bone in humans

The barnacle is the creature with the largest penis as a proportion of its body size.

Two male mallards, Anas platyrhynchos

Homosexual behavior in animals

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Various non-human animal species exhibit behavior that can be interpreted as homosexual or bisexual.

Various non-human animal species exhibit behavior that can be interpreted as homosexual or bisexual.

Two male mallards, Anas platyrhynchos
Two male giraffes in Kenya.
Swans, Cygnus atratus
Two male mallards, Anas platyrhynchos
A female Labrador dog mounting another.
The American bison is a bovine mammal which displays homosexual behavior.
Bonobo
The spotted hyena is a moderately large, terrestrial carnivore native to Africa.
The head of darner dragonfly (Basiaeschna janata)

Between males, homosexual behaviour includes rubbing of genitals against each other, which sometimes leads to the males swimming belly to belly, inserting the penis in the other's genital slit and sometimes anus.

Fossa (animal)

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Carnivorous mammal that is endemic to Madagascar.

Carnivorous mammal that is endemic to Madagascar.

The fossa has a cat-like appearance, resembling a small cougar.
Cranium (dorsal, ventral, and lateral views) and mandible (lateral and dorsal views)
External genitalia of Cryptoprocta ferox
Fossa are active both day and night (cathemeral).
Fossa illustration circa 1927

In comparison, the glans of felids is short and spiny, while that of viverrids is smooth and long.

Retractor muscle of the penis

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In some animals the male penis possesses a muscle enabling retraction into the prepuce.

Gonopodium of a black molly (Poecilia sphenops).

Intromittent organ

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General term for an external organ of a male organism that is specialized to deliver sperm during copulation.

General term for an external organ of a male organism that is specialized to deliver sperm during copulation.

Gonopodium of a black molly (Poecilia sphenops).
Baculum of a dog (Canis lupus familiaris).

In some turtles, crocodiles, some birds, and in all mammals, males possess a penis centered along the midline of the body.

Diagram of the scrotum. On the left side the cavity of the tunica vaginalis has been opened; on the right side only the layers superficial to the Cremaster muscle have been removed.

Scrotum

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Diagram of the scrotum. On the left side the cavity of the tunica vaginalis has been opened; on the right side only the layers superficial to the Cremaster muscle have been removed.
Image showing musculature and inner workings of the scrotum.
Stages in the development of the male external genitalia.
Human scrotum in a relaxed state (left) and a tense state (right)

The scrotum or scrotal sac is an anatomical male reproductive structure located at the base of the penis that consists of a suspended dual-chambered sac of skin and smooth muscle.

A newborn joey suckles from a teat found within its mother's pouch

Reproductive system

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Organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction.

Organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction.

A newborn joey suckles from a teat found within its mother's pouch
Didactic model of a mammal urogenital system.
A male common frog in nuptial colors waiting for more females to come in a mass of spawn

The final category are those used for copulation, and deposition of the spermatozoa (sperm) within the male, these include the penis, urethra, vas deferens, and Cowper's gland.

Lion

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Large cat of the genus Panthera native to Africa and India.

Large cat of the genus Panthera native to Africa and India.

The upper cladogram is based on the 2006 study, the lower one on the 2010 and 2011 studies.
Range map showing distribution of subspecies and clades
Skull of an American lion on display at the National Museum of Natural History
red Panthera spelaeablue Panthera atroxgreen Panthera leoMaximal range of the modern lionand its prehistoric relativesin the late Pleistocene
Lion in Gir National Park
Lions in a tree near Lake Nakuru
Head rubbing among pride members is a common social behaviour
A lioness in Gir National Park
Two captive male Asiatic lions in Sanjay Gandhi National Park, India
Bas-relief of a wounded lioness from Nineveh, c. 645–635 BC
The Tsavo maneaters of East Africa on display in the Field Museum of Natural History in Chicago
Granite statue of the Egyptian goddess Sekhmet from the Luxor Temple, dated 1403–1365 BC, exhibited in the National Museum of Denmark
Roaring and striding lion from the Throne Room of Nebuchadnezzar II, 6th century BC, from Babylon, Iraq
The Lion Capital of Ashoka, which has been an emblem of India
Dorothy Gale meets the Cowardly Lion in The Wonderful Wizard of Oz. Art by W. W. Denslow, 1900.

Like those of other cats, the male lion's penis has spines that point backward.