(I) The book furnishes us with some really fascinating information about hummingbirds. (II) For instance, they can hover for as long as 50 minutes at a time. (III) Their lovely colouring is even then apparent. (IV) They don't simply use their wings in order to do this, but also their tails which they spread like a fen to give extra lift. (V) Hovering allows access to nectar but requires so much nectar that they have to consume one and a half times their body weight in nectar every day.