A forest is inhabited by rabbits and foxes. Every year, each rabbit gives birth to 7 babies and each fox gives birth to 2 babies on average. Foxes try to catch and eat rabbits; each month, each fox has a 3% chance of catching each of the rabbits present in the forest. Each month, every fox that does not eat a rabbit starves to death. Write the differential equations for the number of foxes and rabbits in the forest.