mammal
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noun
a
warm-blooded
vertebrate
animal
of a
class
that is distinguished by the possession of
hair
or
fur
, the
secretion
of
milk
by
female
s for the
nourishment
of the
young
, and (typically) the
birth
of
live
young
.
哺乳動物
The first small mammals evolved from
reptile
s about 200 million years ago, and the group diversified rapidly after the extinction of the
dinosaur
s to become the dominant form of
land
animal, with about 4,000 living
species
. Mammals belong to the class
Mammalia
, which contains the subclass
Prototheria
(
monotreme
s) and the infraclasses
Metatheria
(
marsupial
s) and
Eutheria
(
placental mammal
s such as
rodent
s,
cat
s,
whale
s,
bat
s, and
human
s).
ORIGIN
early
19th century
: anglicized form (first used in the plural) of modern
Latin
mammalia
, neuter plural of
Latin
mammalis
(adjective), from
mamma
‘
breast
’ (see
mamma
2).