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Extinction event
An extinction event (also
extinction-level event, ELE)
occurs when a large number
of species die out in a
relatively short period of
time. Since life began on
Earth, a number of major
mass extinctions have
... > full story
Mesozoic
The Mesozoic Era is one of
three geologic eras of the
Phanerozoic eon. The
Mesozoic includes three
geologic periods: from
oldest to youngest, they are
the Triassic, the Jurassic
and the Cretaceous periods. ... > full story
Cretaceous-Tertiary extinction event
The Cretaceous-Tertiary
extinction event was a
period of massive extinction
of species, about 65.5
million years ago. It
corresponds to the end of
the Cretaceous Period and
... > full story
Conservation status
The conservation status of a
species is an indicator of
the likelihood of that
species continuing to
survive either in the
present day or the future.
Many factors are taken into
account when assessing the
... > full story
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Permian-Triassic extinction event
The Permian-Triassic (P-T or PT) extinction event, sometimes informally called the Great Dying, was an extinction event that occurred approximately 251.0 million years ago (mya), forming the boundary ... > more -
Decline in amphibian populations
Dramatic declines in amphibian populations, including population crashes and mass localized extinction, have been noted since the 1980s from locations all over the world, and amphibian declines are ... > more -
Extinction
In biology and ecology, extinction is the cessation of existence of a species or group of taxa, reducing biodiversity. The moment of extinction is generally considered to be the death of the last ... > more -
Coral bleaching
Coral bleaching results when the symbiotic zooxanthellae (single-celled algae) are released from the original host coral organism due to stress. The corals that form the structure of the great reef ... > more -
Endangered species
An endangered species is a population of an organism (usually a taxonomic species), which because it is either few in number or threatened by changing environmental or predation parameters, leaving ... > more -
Trophic level
In ecology, the trophic level is the position that an organism occupies in a food chain - what it eats, and what eats it. Wildlife biologists look at a natural "economy of energy" that ultimately ... > more -
Black-footed Ferret
TThe Black-footed Ferret is a small carnivorous North American mammal. The Black-footed Ferret is the most endangered mammal in North America, according to the U. S. Fish and Wildlife Service ... > more -
Slash and burn
Slash and burn (a specific practice that may be part of shifting cultivation or swidden-fallow agriculture) is an agricultural procedure widely used in forested areas. Although it was practised ... > more -
Biodiversity
Biodiversity or biological diversity is the diversity of life. There are a number of definitions and measures of biodiversity. Biodiversity is commonly identified at three levels. First there is ... > more
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