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How did grasslands influence mammal evolution during the Miocene Epoch?
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Tertiary Period
Gypsum cones, which resulted from the evaporation of the Mediterranean Sea during the Messinian Salinity Crisis, in the Sorbas basin, Spain.
During the Miocene Epoch, global climatic cooling and drying led to the widespread expansion of grassland ecosystems. This environmental shift profoundly influenced the evolution of herbivorous mammals, which adapted to the new, open habitats in several key ways:12
- Dental Specialization: Many herbivores, which originally possessed low-crowned teeth suited for browsing leafy vegetation, evolved high-crowned, or hypsodont, teeth. These specialized teeth were better equipped to grind the gritty, abrasive silica found in grasses. Over time, these teeth often incorporated secondary cement to strengthen the structure and increase resistance to wear.13
- Locomotor Adaptations: To survive in open environments where cover was limited, many mammals evolved longer limbs, which facilitated faster running to escape increasingly efficient predators.1
- Diversification: The expansion of these grassy habitats, which by the late Miocene resembled modern savannas, triggered significant evolutionary turnover and diversification among grazing mammal groups.12
These adaptations allowed various mammalian lineages to thrive as their environments transitioned from dense forests to the more open, grassy landscapes that characterize much of the modern world.1