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21 hours ago · Theria. Marsupialia. Placentalia. A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia ( / məˈmeɪli.ə / ). Mammals are characterized by the presence of milk -producing mammary glands for feeding their young, a neocortex region of the brain, fur or hair, and three middle ear bones.
21 hours ago · Some plants have special nectar exuding structures, extrafloral nectaries, that provide food for ants, which in turn protect the plant from more damaging herbivorous insects. Species such as the bullhorn acacia ( Acacia cornigera ) in Central America have hollow thorns that house colonies of stinging ants ( Pseudomyrmex ferruginea ) who defend the tree against insects, browsing mammals, and epiphytic vines.
