At first glance, rats and mice may appear similar, but several key differences set them apart ... Distinguishing between rat and mouse droppings can help with identification.

The US does not include within its animal welfare laws and regulations the rats, mice and birds who are subjected to research ... A few animals more or less do not make a big difference in the budget, ...

Its tendency to increase the body weight of female pups at weaning is valuable for transgenic mouse breeding and production 10. Because rats and mice are ... be observable between studies and ...