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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Barnacle

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Type of arthropod constituting the subclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters.

Type of arthropod constituting the subclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters.

Whale barnacles attached to the throat of a humpback whale
Nauplius larva of Elminius modestus
Nauplius larva of a barnacle with fronto-lateral horns
"Cirripedia" from Ernst Haeckel's Kunstformen der Natur (1904): The crab at the centre is nursing the externa of the parasitic cirripede Sacculina.
Barnacles and limpets compete for space in the intertidal zone
Goose barnacles, with their cirri extended for feeding
Underside of large Chesaconcavus sp. (Miocene) showing internal plates in bioimmured smaller barnacles
Balanus improvisus, one of the many barnacle taxa described by Charles Darwin
Miocene (Messinian) Megabalanus, smothered by sand and fossilised
Chesaconcavus, a Miocene barnacle from Maryland
Barnacles attached to pilings along the Siuslaw River in Oregon
Goose barnacles in a restaurant in Madrid

To facilitate genetic transfer between isolated individuals, barnacles have extraordinarily long penises⁠.

Squamata

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Largest order of reptiles, comprising lizards, snakes, and amphisbaenians (worm lizards), which are collectively known as squamates or scaled reptiles.

Largest order of reptiles, comprising lizards, snakes, and amphisbaenians (worm lizards), which are collectively known as squamates or scaled reptiles.

Slavoia darevskii, a fossil squamate
Trachylepis maculilabris skinks mating
The Japanese striped snake has been studied in sexual selection.
The effects of central fusion and terminal fusion on heterozygosity
Map showing the global distribution of venomous snakebites
Desert iguana from Amboy Crater, Mojave Desert, California

The male members of the group Squamata have hemipenes, which are usually held inverted within their bodies, and are everted for reproduction via erectile tissue like that in the mammalian penis.

Onykia ingens

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Species of squid in the family Onychoteuthidae.

Species of squid in the family Onychoteuthidae.

Mature female (38.4 cm ML, 1.875 kg weight) from the Chatham Rise
Tentacular club of Onykia ingens
Piece of ventral mantle skin
Gladius with cross-sections

Penis elongation has been observed in this species; when erect, the penis may be as long as the mantle, head and arms combined.

Neotrogla

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Genus of barklice noted for its reversed sex roles and organs, traits shared by all species of the genus.

Genus of barklice noted for its reversed sex roles and organs, traits shared by all species of the genus.

Female Neotrogla possess a penis-like organ, properly termed a "gynosome", but interchangeably called a penis.