Search results
Results from the WOW.Com Content Network
Decline in amphibian populations. The Golden toad of Monteverde, Costa Rica, was among the first casualties of amphibian declines. Formerly abundant, it was last seen in 1989. Since the 1980s, decreases in amphibian populations, including population decline and localized mass extinctions, have been observed in locations all over the world.
Reasons for amphibian declines are often termed ‘enigmatic' because the cause is unknown. Why some areas are affected by the fungus while others are not is not fully understood. Oscillating factors such as climate, habitat suitability, and population density may be factors which cause the fungus to infect amphibians of a given area.
Golden toad. The golden toad (Incilius periglenes) is an extinct species of true toad that was once abundant in a small, high-altitude region of about 4 square kilometres (1.5 sq mi) in an area north of the city of Monteverde, Costa Rica. [3] It was endemic to elfin cloud forest. [4] Also called the Monte Verde toad, Alajuela toad and orange ...
The arroyo toad is a stocky, blunt-nosed, warty-skinned species of toad, 5 to 7.5 cm (2.0 to 3.0 in) long. It has horizontal pupils, and is greenish, grey or salmon on the dorsum with a light-colored stripe across the head and eyelids. It has light sacral and mid-dorsal patches, large, oval and widely separated parotoid glands, and weak or ...
Dog behavior is the internally coordinated responses of individuals or groups of domestic dogs to internal and external stimuli. [1] It has been shaped by millennia of contact with humans and their lifestyles. As a result of this physical and social evolution, dogs have acquired the ability to understand and communicate with humans. [2]
Diseases, like Batrachochytrium dendrobatidis (Bd) and Ranavirus infections, have been detected in hellbender populations, contributing to population declines. [2] An emerging disease threat is the salamander chytrid fungus (Batrachochytrium salamandrivorans, or "Bsal"), which has caused severe declines in other salamander species. Although not ...
Bufo politus Cope, 1862. The western toad (Anaxyrus boreas) is a large toad species, between 5.6 and 13 cm (2.2 and 5.1 in) long, native to western North America. [1][3][4] A. boreas is frequently encountered during the wet season on roads, or near water at other times. It can jump a considerable distance for a toad.
Neoteny (/ niˈɒtəni /), [1][2][3][4] also called juvenilization, [5] is the delaying or slowing of the physiological, or somatic, development of an organism, typically an animal. Neoteny is found more in modern humans compared to other primates. [6] In progenesis or paedogenesis, sexual development is accelerated.