Why do gerbils reproduce between 2 months and 18 months?

Is it true that dried chicken fillets for dogs from China can cause kidney problems? What are the natural predators of foxes? What sea creature resembles a knight in chess? What is the size of the giraffe? Why do horses rear? Why didn't horses pull wagons? Do hedgehog eat rats? Do skunks bury their feces like a cat? Who wrote outside of a dog a book is man's best friend Inside of a dog it's too dark to read? Do orcas eat shrimp? How long do female dachshunds have their period? Is and elephant cold blooded or hot blooded? Is a bull cow a bovine? Is time or heart beats per minute the dependent variable? How do you insure a dog? You have two rabbits when you went out to their hutch you found the females hair everywhere and you found a baby rabbit half eaten on the floor? Are elephants evil? Do black rhinos reproduce sexually or asexually? Which places are you most likely to find a red fox? What is the number one killer of Americans today is often called silent killer?