Butterflies are cold-blooded animals, so they have to keep cosy or they won't be able to fly around. 2/7: The delicate wings of butterflies are comprised of four intricate layers of chitin ...

Animal migration has fascinated humans for ... Perhaps the best-known insect migrant is the monarch butterfly (Danaus plexippus) (Figure 3a). At the end of every summer, more than 100 million ...

All you need is a yard. Anyone can help monarch butterflies. All you need is a yard. One animal purifies our water. Another provides a vital food source for three other species. This photo essay ...