Germany's ecosystems support a wide variety of plants and animals and are now strictly protected. One such protected animal is the White-tailed Eagle, which has been Germany's national symbol since Roman times. Laws now protect the habitats of vulnerable species like the eagle to help preserve Germany's biodiversity. Education in Germany is free for all children between the ages of 6 to 15. Students learn core subjects like math, science, and geography at primary school. In high school, there are multiple school types students can attend depending on their interests and grades. German shoppers know they can recycle packaging with the "Green dot" symbol, which indicates the material is either recyclable or made from recycled content.