Jays are birds that like to hide food like acorns and hazelnuts in many spots so they can eat them later. Sometimes, they forget where they put these nuts. When they forget, the nuts can grow into new trees. This helps the forest because it plants new trees that give homes to animals and clean the air. So, even when jays forget their food, they are helping the forest grow!
You can also say it like this: Jays hide nuts in different places to save them for later, but sometimes they forget. When they forget, those nuts can grow into new plants and trees, making the forest bigger and healthier.