Features which make mammals as dominant and
successful animals are
(i) The presence of an insulating and protective hairy
exoskeleton.
(ii) They are warm-blooded so have high rate of
metabolism.
(iii) They are viviparous animals and show placentation
and intrauterine development which increases the
chances for survival of young ones.
(iv) They show high degree of parental care.
(v) They have more developed hearing efficiency due to
the presence of pinna, three ear-ossicles and coiled
cochlea in the ear.
(vi) They are able to speak through indicative/verbal
language.
(vii) They have good power of learning due to the presence
of more developed brain.