Satellite broadcasting switched to digital much earlier than terrestrial broadcasting. Ecological diversity includes the variation in both terrestrial and aquatic ecosystems. Cornwall has varied habitats including terrestrial and marine ecosystems. Marine organisms tend to bioaccumulate lithium more than terrestrial organisms. Insects are prey for a variety of organisms, including terrestrial vertebrates. Its diet consists of both terrestrial and aquatic vegetation. Both terrestrial and aquatic animals undergo aestivation. Birds have the most species of any class of terrestrial vertebrates. Pine pollen is also involved in moving plant matter between terrestrial and aquatic ecosystems. Shark skeletons are very different from those of bony fish and terrestrial vertebrates. The first fully terrestrial vertebrates were amniotes. A wide variety of terrestrial and aquatic animals are hunted for sport. However, they evolved from originally terrestrial mammals. This is in contrast to delivery through traditional terrestrial, satellite, and cable television formats. It features Arctic wildlife, both terrestrial and marine.