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The males do not have to compete with other males, and female anemone fish are typically larger. When a female dies a juvenile (male) anemone fish moves in, and "the resident male then turns into a female and reproductive advantages of the large female–small male combination continue". [22] In other fishes sex changes are reversible.
Urechis unicinctus, known as the fat innkeeper worm or penis fish, [3] [4] is a species of marine spoon worm in East Asia. It is found in Bohai Gulf of China and off the Korean and Hokkaido coasts. [4] It is not to be confused with a closely related species, Urechis caupo, which occurs on the western coast of North America and shares common ...
Male mammals ejaculate semen through the penis into the female reproductive tract during copulation. [26] [27] Ejaculation usually occurs after only one intromission in humans, canids, and ungulates, but occurs after multiple intromissions in most mammal species. [28] [29] Copulation can induce ovulation in mammal species that do not ovulate ...
After getting modified, the sperm passes into the penis. During mating season, the glandular cells in the penis sheath and prepuce swell to facilitate eversion of the penis. The sperm gets pushed through the penis, where they are introduced into the tail end of its copulatory partner. Within the partner snail, after fertilization from the ...
Other animals reproduce sexually with external fertilization, including many basal vertebrates. Vertebrates reproduce with internal fertilization through cloacal copulation (in reptiles, some fish, and most birds) [3] or ejaculation of semen through the penis into the female's vagina (in mammals). [4] [5] [3]
The spawn (eggs) of a clownfish.The black spots are the developing eyes. Spawn is the eggs and sperm released or deposited into water by aquatic animals.As a verb, to spawn refers to the process of freely releasing eggs and sperm into a body of water (fresh or marine); the physical act is known as spawning.
The Pennsylvania Fish and Boat Commission fine tuned its walleye stocking program to help anglers catch more fish. Here's how. A look at where walleyes are stocked in Pa. and how to catch them
Penis fencing is a mating behavior engaged in by many species of flatworm, such as Pseudobiceros hancockanus. Species which engage in the practice are hermaphroditic ; each individual has both egg-producing ovaries and sperm-producing testes .