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Reproductive success of many amphibians is dependent not only on the quantity of rainfall, but the seasonal timing. [87] In the tropics, many amphibians breed continuously or at any time of year. In temperate regions, breeding is mostly seasonal, usually in the spring, and is triggered by increasing day length, rising temperatures or rainfall.
[66] [67] Amphibians must return to water to lay eggs; in contrast, amniote eggs have a membrane ensuring gas exchange out of water and can therefore be laid on land. Amphibians and amniotes were affected by the Carboniferous rainforest collapse (CRC), an extinction event that occurred around 307 million years ago. The sudden collapse of a ...
The curved claws can become entangled in carpet or thick fabric, which can cause injury if the cat is unable to free itself. Most cats have a total of 18 digits and claws: 5 on each forefoot (the 1st digit being the dewclaw), and 4 on each hind foot. The dewclaw is located high on the foreleg, is not in contact with the ground and is non-weight ...
Quadrupedalism is a form of locomotion where animals have four legs that are used to bear weight and move around. An animal or machine that usually maintains a four-legged posture and moves using all four legs is said to be a quadruped (from Latin quattuor for "four", and pes , pedis for "foot").
Many vertebrates are limbless, limb-reduced, or apodous, with a body plan consisting of a head and vertebral column, but no adjoining limbs such as legs or fins. Jawless fish are limbless but may have preceded the evolution of vertebrate limbs, whereas numerous reptile and amphibian lineages – and some eels and eel-like fish – independently lost their limbs.
Image credits: jjky665678 It turns out that cats have their own analogue of a smile - they simply blink slowly when they look at their owners. And scientists who have studied thousands of cat ...
Cats may not see as many colors as humans but have better light perception. Cats will adjust their eyes during the day, allowing less light to filter in, while their pupils will expand at night to ...
X-ray showing the skeleton of Typhlonectes (Typhlonectidae). Caecilians' anatomy is highly adapted for a burrowing lifestyle. In a couple of species belonging to the primitive genus Ichthyophis vestigial traces of limbs have been found, and in Typhlonectes compressicauda the presence of limb buds has been observed during embryonic development, remnants in an otherwise completely limbless body. [7]