Hiking in the mountains, Martha kept noticing butterflies at about 4,000-to-5,000 feet above sea level. Those butterflies are hilltopping. It’s when male butterflies of many species go to high points to advertise their fortitude and genes to the...
Hiking in the mountains, Martha kept noticing butterflies at about 4,000-to-5,000 feet above sea level. Those butterflies are hilltopping. It’s when male butterflies of many species go to high points to advertise their fortitude and genes to the...
