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Male diamondback terrapins weigh 300 g (11 oz) on average, while females weigh around 500 g (18 oz). [12] The largest females can weigh up to 1 kg (35 oz). [13] Diamondback terrapins can live up to 40 years in captivity, but scientists estimate they typically live for about 25 years in the wild.
Male box turtles also include concave plastrons, thicker tails with the cloaca closer to the tip, and longer rear legs with larger curved claws which are used to grip the female shell during mating. They also have a similar internal anatomy to freshwater turtles except for the fact that they lack a degenerative cloacal bursae because they do ...
Terrapins do not form a taxonomic unit and may not be closely related. Many belong to the families Geoemydidae and Emydidae. The name "terrapin" is derived from torope, a word in an Algonquian language [1] that referred to the species Malaclemys terrapin (the Diamondback terrapin). It appears that the term became part of common usage during the ...
Extant primates exhibit a broad range of variation in sexual size dimorphism (SSD), or sexual divergence in body size. [4] It ranges from species such as gibbons and strepsirrhines (including Madagascar's lemurs) in which males and females have almost the same body sizes to species such as chimpanzees and bonobos in which males' body sizes are larger than females' body sizes.
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 male plastron is curved inwards to aid reproduction. The easiest way to determine the sex of a tortoise is to look at the tail. The females, as a general rule, have smaller tails, dropped down, whereas the males have much longer tails which are usually pulled up and to the side of the rear shell.
Antennae are extremely sensitive; the feathered antennae of male moths from the Saturniidae, Lasiocampidae, and many other families are so sensitive that they can detect the pheromones of female moths from distances of up to 2 km (1.2 mi) away. Lepidoptera antennae can be angled in many positions.
The male uses his long claws to flutter at the face of the much larger female. Often, the female ignores him. If the female is receptive, she will sink to the bottom of the river and allow the male to mount for mating. If they do mate, after several weeks the female crawls upon land to seek a nesting site.