I bought this rat thinking it was a female that I named Daisy. The reason I bought Daisy was for my neice Eva Jane. She wanted to breed the rats, as she already had a blue male named Stuart. So, being the awesome aunt that I am, I went to the pet store and bought a, so I thought, female rat that I named Daisy. As time passed, Daisy showed signs of being a male rat. As we soon discovered, this Daisy was in fact a dude. So I named him Duke. The rats continued to love each other on conditionally. Every time I would visit my neice, I would bring Duke out to play with Stuart. There even came a time that my neice and her family went to Texas for two weeks and I was left watching both rats. They had an absolute ball together at my house and I felt horrible upon the return of my neice and her family, because Duke would lose his best buddy. Time has passed and Duke gets to visit Stuart regularly, but his new found friends are my two Toy Schnauzers Neka and Spike. He is very confident in my back yard as long as my two pups are there to encouraghe him. He thoroughly enjoys his time out and can't explore enough. Heaven forbid people keep their rats locked in a cage their whole life. they need to be out and able to explore and create and exciting atmosphere for themselves, beyond an exercise wheel. Duke has taught me that much.