When male elephants enter a state of Musth, during the time they begin needing to compete for mates, they have an incredible biological change they undergo. Their testosterone levels skyrocket 60 times their normal levels, and stay there for up to 2 months!. The condition is especially pronounced in male Asian elephants, and you can distinguish an elephant in Musth from one that isn't, by those who are undergoing it carrying their heads and ears hire, along with a very noticeable rumbling sound they emanate.