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The hemipenis is the intromittent organ of Squamata, [4] which is the second largest order of vertebrates with over 9,000 species distributed around the world. They differ from the intromittent organs of most other amniotes such as mammals, archosaurs and turtles that have a single genital tubercle, as squamates have the paired genitalia remaining separate. [5]
The locking is completed by circular muscles just inside the female's vagina; this is called "the knot" tightening thus preventing the male from withdrawing. The circular muscles also contract intermittently, which has the effect of stimulating ejaculation of sperm, followed by prostatic fluid, as well as maintaining the swelling of the penis ...
Male canines are the only animals that have a locking bulbus glandis or "bulb", a spherical area of erectile tissue at the base of the penis. [11] During copulation, and only after the male's penis is fully inside the female's vagina, the bulbus glandis becomes engorged with blood. [ 1 ]
[1] [6] The woolly mammoth, an extinct relative of the elephant that was adapted to cold Arctic environments, had a brown-fat hump like deposit behind its neck that may have functioned as a heat source and fat reservoir during winter. [7] Several species of waterfowl have a protuberance known as the basal knob at the top rear end of their bill.
A new study by CU Boulder engineers in the Science Advances journal suggests that a mechanism called diffusiophoresis may be the reason behind the sharp and detailed patterns found on even the ...
[1] [2] Males also use olfaction to entice females to mate using secretions from glands and soaking in their own urine. [ 1 ] [ 3 ] [ 4 ] During the rut (known as the rutting period and in domestic sheep management as tupping ), males often rub their antlers or horns on trees or shrubs, fight with each other, wallow in mud or dust, self-anoint ...
The giant tubeworms do not eat as other animals do. Instead, bacteria residing in their body in a sack-like organ turn sulfur from the water into energy for the animal.
Move over, Wordle, Connections and Mini Crossword—there's a new NYT word game in town! The New York Times' recent game, "Strands," is becoming more and more popular as another daily activity ...