Species
Currently, five species are recognised in this genus: The common name for species in this genus is the "spotted dolphins" or the "bridled dolphins". Stenella dolphins tend to be more active during nighttime and spend their daytime resting. Although these dolphins are supposed to spend 60% of their daytime resting, they happen to be exposed to human activities for 80% of their day. These patterns of sleep deprivation can have negative impact on their resting habit and leads to decline in their population size. ==References==