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A higher intrinsic rate of natural increase (r) indicates a greater capacity for population growth.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
Small mammals such as mice generally have a much higher intrinsic rate of increase than large, slow-lived vertebrates. They mature early, have short generation times, reproduce frequently, and produce several offspring per litter. These traits place reproductive contribution early in the life table, which strongly elevates r because offspring produced sooner can themselves reproduce sooner. Elephants and humans mature late, have long gestation, small litters, and long intervals between births; their populations therefore increase slowly even when adult survival is high. Many snakes have interm
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 11
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