Why Were Prehistoric Animals Bigger Than Today’s Animals?

Evolution is a slow but sure process that, in most instances, takes millions of years before any serious notable changes can be noticed. One question that has puzzled many people is, why were animals so big in the past?
For a long time, environmental factors such as higher oxygen content in the air and greater land masses were thought to contribute to their large size. To understand how environmental conditions may have contributed to the evolution of larger and more complex animals in prehistoric times, it is important to consider the types of habitat that would have been common during this era.
In particular, these organisms likely lived in warm, moist climates, where food was abundant, and there was limited competition for resources. Given these conditions, natural selection may have favored traits such as increased body size over features such as heightened agility or speed, as bigger animals were better equipped to survive and thrive in this environment.

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