Germans tend to follow the rules even if they grouse about it afterwards. The latest rule in in Walldorf, Germany involves keeping felines inside until the end of August to protect the endangered crested lark, which nests on the ground.

The bird’s population has drastically declined recently, most likely due to cats and other predators attacking the birds as they nest. Those who who ignore the rule could face a €500 fine, and if a cat kills a crested lark, the fine can be up to €50,000. So keep your cat inside to save a bird.

To learn more about the latest German law designed to protect a rare bird, click here.