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anurans and males
In most anurans the males deposit sperm onto the eggs as they are being laid, however males of the genus Ascaphus possess an intromittent organ, unique among anurans, for internal fertilization.

anurans and they
Most opalines live as endocommensals in the large intestine and cloaca of anurans ( frogs and toads ), though they are sometimes found in fish, reptiles, molluscs and insects.

anurans and are
The next largest extant anurans are the Cane toad, about a third smaller than the Goliath in the largest specimens, and the African bullfrog, which is just over half the size of the Goliath.

anurans and .
Its reproductive success is partly because of opportunistic feeding: it has a diet, unusual among anurans, of both dead and living matter.
Some species of anurans hybridize readily.
However, opalines have been found in saltwater fish which have no access to anurans.
Amplexus chiefly occurs aquatically, but limulids and some more terrestrial anurans like the disc-tongued frogs ( Discoglossidae ) perform amplexus on land.
It is also by far the largest of the three ; its more than 5, 000 different species make up over 96 % of all living anurans.
Diet varies widely, with examples including Tornierella, who specialize on snails, and Afrixalus fornasinii, the only terrestrial frog known to prey on eggs of other species of anurans.
The name Batrachomorpha was coined by the Swedish palaeontologist Gunnar Säve-Söderbergh in 1934 to refer to ichthyostegids, temnospondyls, anthracosaurs, and the anurans.
The family Centrolenidae is a clade of anurans.
Allophryne, the Tukeit Hill Frog, is part of a hitherto ( see below ) monotypic subfamily of anurans: Allophryninae.

males and usually
Typically, prolonged breeders congregate at a breeding site, the males usually arriving first, calling and setting up territories.
The assembled frogs may call in unison and frenzied activity ensues, the males scrambling to mate with the usually smaller number of females.
Coats of female bongos are usually more brightly coloured than those of males.
However, such fights are usually discouraged by visual displays, in which the males bulge their necks, roll their eyes and hold their horns in a vertical position while slowly pacing back and forth in front of the other male.
However, females usually mark without urinating and mark less frequently than males overall.
Dominant males are highly protective of the females, but they usually cannot prevent all the subordinates from copulating.
Where the scarring is clearly visible such as the face, legs, and arms, females will usually obtain a greater amount of compensation than males.
In Asian elephants, only males have tusks, but both males and females of African elephants have tusks and are usually less hairy than their Asian cousins.
For example, in the 17th century cross dressing was common in plays, as, for example, evident in the content of many of William Shakespeare's plays ( and by the actors in the actual performances, since female roles in Elizabethan Theater were always performed by males, usually prepubescent boys ).
Diploid biparental males are usually sterile but a few species that have fertile diploid males are known.
When examined, female hamsters have their anal and genital openings close together, whereas males have these two holes farther apart ( the penis is usually withdrawn into the coat and thus appears as a hole or pink pimple ).
Females and males usually mate monogamously for many years.
Low male-to-female ratios are usually the result of a war, but these figures were lower than the sex ratio of 88. 3 males per 100 females recorded for 1953, the last year of the Korean War.
Although there is usually no parental care after birth, before birth parents may scatter, hide, guard or brood eggs, with sea horses being notable in that the males undergo a form of " pregnancy ", brooding eggs deposited in a ventral pouch by a female.
Ostriches usually weigh from, Ostriches of the East African race ( S. c. massaicus ) averaged in males and in females, while the nominate subspecies was found to average in unsexed adults.
Human orgasms usually result from the stimulation of the penis in males, typically accompanying ejaculation, and the clitoris in females.
Polygyny is the most common form of polygamy ; the much rarer practice of polyandry is the form of marriage in which one woman has two or more husbands at the same time, usually among brothers or males of the same family.
As to the latter variety, as some males return to the household, others leave for a long time, so that there is usually one husband present.
Wild groups usually consist of three to ten individuals, with one reproductively active female, one or more reproductive males, and several nonreproductive helpers that can be either male or female.
Polyandry in primates and other mammals is usually correlated with reduced or reverse sexual dimorphism — females larger than males.
When males of a species are much larger than females, polygyny is usually practiced.

males and arrive
The males arrive first and attempt to establish dominance over a territory.
The males first arrive in early to mid April, often a few days in advance of the females.
As soon as males arrive, they begin displaying, and aggressively defending their territory from other males.
Seven to 15 days after the birds arrive, the males begin constructing nests on the ground, ledges or in a trees.
Some male Wood Thrushes arrive at the breeding grounds several days before the earliest females while other males arrive at the same time as the females, establishing territories ranging in size from 0. 08 to 0. 8 hectares ( one-fifth of an acre to two acres ).
After the males have arrived the beach, the females arrive to give birth.
A songs are sung throughout the day when males first arrive on their breeding grounds.
Adult males usually arrive on the breeding ground before females, from mid-April to early May.
Commencing a few days after females arrive to the colony, sexual displays are used by males to attract partners and advertise their territory, and by pairs once together at the nest site and at changeover of incubation shifts.
The males arrive first and remain in the location for several weeks while the females only stay long enough to mate and spawn.

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