Where have all the butterflies gone?
Everyone likes butterflies. They're beautiful and they don't sting or bite us. But these colorful insects have seen a dramatic decline in the past few decades. And the reason why is even more alarming.
Delicate creatures
Across the globe, butterflies are under threat. According to the German Wild Animal Foundation, the number of butterfly and moth species present in Germany has halved over the last 30 years. For diurnal butterflies, that decline is nearer 70 percent. This photo shows Colias hyale, which was selected as Germany's "butterfly of the year" in 2017.
Sweet juice
Butterflies adore the sweet sap from flowers and blossoms, and enjoy a broad palate. But plant diversity is dwindling, particularly in regions where intensive monoculture agriculture dominates, which leaves little choice for our beloved butterflies.
Butterflies don't like pesticides
Crop protection products like herbicides and pesticides destroy biodiversity. Wild herbs, plants or flowers can't survive in areas with monoculture farming. In many parts of Germany, the scarce Swallowtail butterfly pictured here was once a common sight, but has now vanished from the landscape.
Insects are dying off
The big problem is that pesticides aren't only harming butterflies. Studies show that some regions have seen 80 percent decline in insect numbers compared to 30 years before. Bees, bumblebees, dragonflies, wasps, flies, bugs and butterflies - they all struggle to survive in our intensive-agricultural world of pesticides and fertilizers.
Not enough to eat
A recent study shows that bird numbers are also in a decline. One reason: They can't find enough insects for food. The population of northern lapwings in Germany, for example, is estimated to have shrunk by 80 percent between 1990 and 2013. The number of whinchats has dwindled by 63 percent and black-tailed godwits by 61 Prozent.
A new life in the city?
Astonishingly, the butterfly decline is particularly obvious in the countryside. In towns and cities butterflies are more numerous. They thrive in parks, on cemeteries, on uncultivated land but even in city centers. Here, they obviously find the plant diversity which they miss in the countryside.