Bats have some distinctive life-history traits which may be relevant to understanding why they are reservoirs of these viruses, including the fact that they for

Bats have some distinctive life-history traits which may be relevant to understanding why they are reservoirs of these viruses, including the fact that they form the largest known mammalian aggregations. The fact that in general they don’t succumb to viral disease suggests adaptations of the immune system. One of the most interesting recent suggestions is that daily flight, which elevates metabolism and body temperature analogous to a fever, provides a selective force for coexistence with viral parasites.