Castro says she was on her way to Lima's city center when she spotted the helpless 1-month-old kitten on the highway.
"I was about to get out of the car to pick her up when the motorcycle cop passed by," Castro told Peruvian newspaper El Comercio. "[He said,] 'Stay in the car. I'll take care of it.'"
After bringing Castro the kitten, the officer reportedly declined any reward (preferring to remain anonymous) and went back to work.