Here's why:
* Physical Differences: Male and female rabbits don't have super obvious visual differences like some other animals. There are subtle differences in the size of their genitals, but these are very difficult to see unless you're a vet or experienced breeder.
* Scent: Rabbits communicate a lot through scent. Male rabbits have a stronger scent than females, and they mark their territory with urine. However, this doesn't tell them the sex of another rabbit, just that it's been in the area.
* Behavior: Some people think male bunnies are more aggressive than females, but this isn't always true. Both genders can be aggressive depending on their personality, age, and other factors.
The Bottom Line: If you're trying to determine the sex of a rabbit, it's best to have a vet or experienced breeder examine them.