I am here in May, the most glorious time of year, when the skies are cobalt and cloudless, the nights cool and misty, and the forest leaps with lemurs. The entire eastern coast of Madagascar was once covered in trees; today, most has been logged or burnt for charcoal and replaced in patches by fast-growing eucalyptus. But there are little pockets that have been preserved: the one closest to Tana, called Andasibe, is just 170km away, or four long hours' drive on terrible roads.
Nothing can prepare you, as you hike through dark, primeval forest muggy with the scent of leaves and moss and millions of years of decay, for the howls of indri lemurs calling their companions. Like the cry of an inconsolable woman, or the sliding off-key shrieks of a trombone, they echo in the quiet reserve, making the hair on my neck stand on end. But when I catch sight of them - all thick, soft black, grey and white fur, with little round faces, long noses, and shiny, fluffy tails - they look so sweet I want to squeal out loud myself.
Because the lemurs are protected by a team of guides, they're not particularly fazed by us watching them. Slowly, they shuffle about the branches above our heads, munching on leaves, hanging upside-down to reach particularly delicious bunches of berries and picking at each other's fur with human-like fingers topped with spookily black, perfectly polished nails.
Pictured: A golden-crowned sifaka lemur