Male and female elephants have several physiological differences related to reproduction. One key difference is that male elephants have external tusks, while females have smaller and less prominent tusks or no tusks at all. Additionally, male elephants have larger overall body size compared to females. In terms of reproduction, female elephants have longer reproductive cycles, typically lasting about 4-6 months, while males do not have a specific reproductive cycle. Another important difference is that male elephants enter a state known as musth, during which they experience an increase in testosterone levels and become more aggressive and dominant in order to compete for mating opportunities. Female elephants, on the other hand, come into estrus, or heat, during which they are receptive to mating. These are just a few of the physiological differences between male and female elephants related to reproduction.