A study published in the renowned pages of Science journal has pointed out that in animals world, male uses their larger body parts and naturally beautified parts to attract female. Take the example of peacock. A peacock woos a female through its feather.

The study was carried out by the researchers of Montana University. During the study, it was found that rhinoceros beetles highlight the overall health of the rhinoceros. For example, if a rhinoceros has larger beetles then it means that the reproductive power of it is working at its best.

It has been found that a larger beetles results from increased intake of insulin or increased level of insulin. Insulin is provided to body through meals. Thus, if a rhinoceros has a larger beetles, it could mean that the rhinoceros is consuming good amount of food.

The lead researcher of the study, Douglas Emlen said, "We suggest that exaggerated animal structures may be unfakable signals of quality because of the developmental mechanism responsible for their accelerated growth”. The findings of the study could explain as to why some animals have larger body part while others have normal body growth.