Crowned Lemurs (Eulemur coronatus) are part of the Brown Lemur or True Lemur genus Eulemur.  The best places to see these are at the Amber Mountain National Park and tsingy of Ankarana where they are the focus of a book entitled Lemurs of the Lost World. This endearing account by zoologist Jane Wilson, of her long-term study of these lemurs, amongst Ankarana's inhospitable limestone karst highlands and caves. 

It is the males who wear the most distinctive crown, shaded black and orange. Their bodies are a chestnut brown. Females have an orange crown and more uniform grayish fur. Both genders have very noticeable deep orange eyes. 

Adult Crowned Lemurs weigh around 2kg (4.4 lbs), with bodies 31-36 cm (12-14 in). Their tails are quite a bit longer, reaching ¹/₂ metre (20 inches).

What makes Crowned Lemurs so interesting to watch is how deftly they can move amongst the razor-sharp weathered limestone of Ankarana's tsingy. They seek overnight shelter amongst these rocks at night, travelling to forest by day to feed on fruit, flowers and leaves. 

Estimates vary considerably on their population, but there could be as few as 1,000 of these Endangered lemurs in the wild, with most surviving in the Ankarana National Park.