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Copulation is the union of the sex organs of two sexually reproducing animals for insemination and subsequent internal fertilization. [2] Mating may also lead to external fertilization, as seen in amphibians, fishes and plants. For most species, mating is between two individuals of opposite sexes.
Usually, eggs are laid only by the queen, but the unmated workers may also lay haploid, male eggs either regularly (e.g. stingless bees) or under special circumstances. An example of non-viable parthenogenesis is common among domesticated honey bees. The queen bee is the only fertile female in the hive; if she dies without the possibility of a ...
The specific problem is: due to unclear definitions for fertility, fecundity and derivative terms depending on whether the term is being used in demography, epidemiology or clinical medicine. For example fecundity is the potential to for a female to become pregnant and carry that pregnancy to a live birth in demography, while in clinical ...
The post 50 Of The Most Adorable Photos Of Pregnant Animals (New Pics) first appeared on Bored Panda. If you think some people look perfect when they’re pregnant, wait ‘til you see the ...
The classic example of a semelparous animal is the Pacific salmon, which lives for many years in the ocean before swimming to the freshwater stream of its birth, spawning, and then dying. Other spawning animals which are semelparous include mayflies, squid, octopus, smelt, capelin and some amphibians. [6]
Image credits: soosseli The Finnish photographer also shared more about a significant experience he had while photographing wildlife: “My most memorable moment in nature happened last spring ...
Examples include the oviparous sharks, such as the horn shark, and oviparous rays, such as skates. In these cases, the male is equipped with a pair of modified pelvic fins known as claspers. Marine fish can produce high numbers of eggs which are often released into the open water column. The eggs have an average diameter of 1 millimetre (0.039 in).
The white-spotted pufferfish is a relatively small (10 cm or 3.9 in) fish that was named in 2014 by a research group for the National Museum of Nature and Science. [2] The fish has a brownish-yellow body with white spots and the ventral part of the body is translucent. [2]