Here in Madagascar, one of the most bizarre of all mammals is on the prowl.
The aye-aye, like the sengi, lives on insects.
But the ones that she seeks she can't see, for they're buried deep inside branches.
They're beetle grubs.
To find them, she has a special talent.
She taps her fingers on the wood, up to eight times a second, and listens for the tiny change in resonance
that indicates a hollow spot within.
Her hearing is so acute she can identify the precise position in which to gnaw a hole in order to reach the grub.
And she has a grotesquely long middle finger with which to skewer it.
It takes a young aye-aye four years to perfect this technique.
But once it has done so, it can collect prey that no other mammal can reach.

These rainforests are unlike any other rainforest on earth, and they are home to Madagascar's most successful inhabitants.
They are lemurs.
There are 80 different types, from nocturnal, mouse-sized creatures to this, the biggest, the size of a child.
It's an indri.
They are direct descendents of those first primitive mammals that had washed in from Africa by chance, and now they live nowhere else.
They have almost dog-like faces.
But they are primates, related to us.
And when you watch them, you can see it.
They are highly social.
At two years old this young male is an adolescent, but he is still close to his mother.
His little sister is just six months old.
This family group will stay together for several more years.
Lemurs also have the grasping hands and feet of all primates.
It's fundamental for a life in the trees, as well as an effective way to put a stranglehold on an older brother.
For an indri, childhood is long.
It's nine years before they are fully adult.
There is plenty of time for play, and perfecting their impressive jumping skills.
And perhaps even a spot of showing off.

Smell is of particular importance to the primates that live in Madagascar, the lemurs.
They have pointed snouts and wet noses.
These are ring-tail lemurs.
The males have sharp pads on their wrists with which they scratch the trunks of young trees.
Glands on their wrists impregnate the cut bark with a pungent smell that acts as a territorial marker.
Females make smelly marks in their own way.
This one's scent carries another signal as well as the territorial one.
It tells males that she is coming into heat.
But she will only be sexually receptive for 24 hours or less.
So tensions run high among the males.
Amid the commotion, some males sneak off.
They have anointed their tails with scent and waft it towards her in an attempt to persuade her to mate.
She's ready, but fussy.
This male adds more of his wrist gland perfume to his tail.
It seems to work, for they leave the party together.
And he wafts his way to victory.

Meet the tamarins who brighten up life at the National Zoo in Washington, D.C.
This is Eduardo.
He's the dad.
This is laranja.
She's the mom.
And here are their twin daughters, Samba and Gisela.
For the next six months the family will enjoy life without bars cages or fences.
That's right.
They'll roam free, not a restraint in sight.
The whole zoo is the little fur family's home for now.
But things change as we will see.
Golden lion tamarins get their name because they never have a bad hair day.
500 years ago, explorers from Europe came to southern Brazil.
In the Atlantic coastal rainforests, the tamarins homeland, they saw marvelous creatures moving through dense greenery.
The first thing the visitors thought of when they saw tamarins head up close was the king of beasts.
But except for being fellow mammals, a mane is mainly all tamarins and lions have in common.
Lions are big burly Plains dwellers.
Tamarins are tiny adults weigh about a pound and a half, and they're related to the marmoset, another small long-tailed monkey.
They spend most of their time in trees.

So female mandrills they do actually like males with nice big colorful bums.
The males, they are so handsome.
They have both pink, purple, blue and red and it shines so brightly that you have no doubt where he is when he walks in the forest far away from you.
Like other monkeys and apes, they live in a hierarchy, so if you look into a troop of mandrills, there will always be one mandrills more colorful than all the other males, and there will be the high ranking male and the lower ranking male, they will also
have colors but they will be less flashy, actually.
The males, they actually fight for the level in the monkey society, so when a lower ranking mandrill is fighting his way up through the rank, when they win the crown, if you can say that, his testosterone will actually rise and the colourful face and bum will actually come by itself.　(わからん！)
So the high level of testosterone actually leads them to lose hair on their bum, so the bright skin is displayed even more.
The advantages of being big and colorful is that you get the right to mate with the females.
It does show which male will give her the good kids, so it's the ability to actually color increase or color enhance. (ぜんぜんわからん！)
That tells all the females that "Wow you ladies, come to me because I can give you your good offspring."