Forests canopy is a very, very living biome for pollinators however. You’ll find birds, insects (and small mammals) in droves over the canopy but no “megafauna” indeed.

Francis Hallé work on forests, canopies and trees architecture is fascinating and insightful. He’s one of the creator of the “radeau des cimes”, an aerostat designed to study the canopy.

Bonus point: forest tends to retain water much better than grassland and therefore are less prone to drought.