2. Common Species
• Common species are designations used in
ecology to describe the population status of a
species. Commonness is closely related to
abundance. Abundance refers to the frequency
with which a species is found in controlled
samples; in contrast, species are defined as
common or uncommon based on their overall
presence in the environment.
4. Rare Species
•A rare species is a group of organisms that are
very uncommon, scarce, or infrequently
encountered. This designation may be applied to
either a plant or animal taxon, and is distinct
from the term endangered or threatened.
5. Rare species
•Example-
• Bengal tiger
• Asiatic Lion
• Snow leopard
• One-horned Rhinoceros
• Black buck
• Lion-tailed macaque
• Resplendent Tree Frog
• Kashmiri Red stag
7. Vulnerable species
A vulnerability is mainly caused by habitat loss
or destruction.
A vulnerable species is one which has been
categorized by the International Union for
Conservation of Nature as likely to become
endangered unless the circumstances
threatening its survival.
9. Endangered Species
•An endangered species is one which has been
categorised by the International Union for
Conservation of Nature as likely to become
extinct. Conservation biologists use the IUCN
Red List, where ‘‘endangered’’ is the second
most severe conservation status for wild
populations, following critically endangered.
11. Extinction
•Extinction is the termination of a taxon by the
death of its last member. A taxon may become
functionally extinct before the death of its last
member if it loses the capacity to reproduce and
recover. The complete disappearance of a
species from Earth.
•Example- Mammoth, Dodo, Dinosaur, Sabar
toothed Tiger