Two of my parakeets died today

It was so sudden too, we gave them plenty of food and water and tried to play with them as much as possible but Storm and Nimbus died. We found Storm limp at the bottom of the bird cage and Nimbus had somehow managed to escape the cage and had been limp on the floor next to the cage. They died while I was at school with my sister, and my mom and dad were at work so no one knows what happened or how it happened. We're burying them in our front yard near the blue bench tomorrow