Size-Sensing Mechanism of Mammals How to determine " the targeted size "  in mammal  by size-sensing mechanism？
　"Know our own size"　Everything in the world has a size.
　How were these sizes determined?
　 And is it the right size?

　We mammals have a species-specific size.
　● How is this size maintained?
　    a size detection mechanism exists to keep the size within a certain range.
　● We can the size of animals be changed freely?