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| Scientists have discovered that not all animal species evolve towards larger sizes. (Image: baothuongmai) |
In 1871, zoologist Edward D. KePu concluded that: The larger the volume of an organism, the more advantageous it is in resisting enemies, competing for food, and claiming territory. Therefore, in the field of biology, it is generally believed that all species, whether microscopic or terrestrial, or those living in the sea, evolve towards larger physical forms over time.
To investigate whether a larger head size truly correlates with advantages, Professor Jieposiji from the University of Chicago spent over 10 years analyzing the evolution of mollusks. The statistical results were surprising. Upon analyzing specimens, it was found that only 27-30% of mollusks continued to grow larger, while 26-27% exhibited a trend of becoming smaller. Even more surprisingly, 25-28% displayed complex trends, with smaller mollusks shrinking even further, while larger mollusks continued to grow.
Why do not all animals evolve towards larger sizes? Currently, there is no definitive conclusion that fully convinces scientists.
The larger the animal’s body, the better it can protect itself from threats,
but it may also be constrained by slower movements.
And it consumes a large amount of energy, requiring constant feeding.
