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Vor 5 Tagen · Bird, any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from other animals. They are warm-blooded vertebrates more related to reptiles than mammals. Learn more about birds in this article.
- Behaviour
Bird - Migration, Communication, Adaptation: Birds depend to...
- Muscles and Organs
Bird - Muscles, Organs, Flight: Birds have a complete...
- Skeleton
Bird - Skeleton, Flight, Feathers: The avian skeletal system...
- Classification
Bird - Aves, Species, Orders: In classifying birds, most...
- Extinction
Extinction, in biology, is the dying out or extermination of...
- Behaviour
Vor 4 Tagen · Ecology, study of the relationships between organisms and their environment. Some of the most pressing problems in human affairs—expanding populations, food scarcities, environmental pollution including global warming, extinctions of plant and animal species, and all the attendant sociological and
Vor 2 Tagen · Extinction, in biology, is the dying out or extermination of a species. It occurs when species are diminished because of environmental forces (natural or human-made) or because of evolutionary changes in their members. Learn more about mass extinctions and modern extinctions.
Vor 2 Tagen · Biodiversity. An example of the biodiversity of fungi in a forest in North Saskatchewan (in this photo, there are also leaf lichens and mosses ). Biodiversity (or biological diversity) is the variety and variability of life on Earth. It can be measured on various levels. There is for example genetic variability, species diversity, ecosystem ...
Vor einem Tag · Subspecies. Nine recent tiger subspecies have been proposed between the early 19th and early 21st centuries, the Bengal, Malayan, Indochinese, South China, Siberian, Caspian, Javan, Bali and Sumatran tigers.
Vor 5 Tagen · Biodiversity is the variation in living forms and can be measured in ways that include the number of species, functional variety of species, evenness of species distribution or genetic...
Vor 3 Tagen · “A species is more than simply a collection of individuals,” he adds. “The death of an endling means much more than the loss of a number of individuals.”
