Kloss's gibbon (Hylobates klossii), also known as the Mentawai gibbon or the bilou, is a primate in the gibbon family, Hylobatidae. It is identifiable in that it is all black, resembling the Siamang with its black fur, but is considerably smaller and lacks the Siamang's distinctive throat pouch. Kloss's gibbon reaches a size 44 to 63 cm and weigh at most 6 kg. As is the case for all gibbons, they have long arms and no tail.
Kloss's gibbon exclusively lives on the Mentawai Islands that lie to the west of Sumatra. It is a diurnal inhabitant of the rain forest that hangs in the trees from its long arms and rarely comes to the ground. Like all species of gibbons it lives together in pairs that stake out a territory from approximately 20 to 30 hectares of size. This area is defended vehemently against other gibbons. Its diet consists mainly of fruits, occasionally also eating different plant parts, bird eggs, insects and small vertebrates.
The singing of the female Kloss's gibbon is considered the most beautiful of all the gibbons' songs. Unlike most other gibbon species (except for the Javan silvery gibbon, Hylobates moloch), Kloss's gibbon males and females do not sing duets. Males typically sing in the hour before sunrise, while an all-female chorus occurs after sunrise. The singing of the gibbons serves to warn off other animals from their territory, and possibly to strengthen the family bonds.
Don't you cry, don't you look so sad
We both knew somehow this day would come
I know you want what is best for me
And I need to see you smile
From where I started off to where I am
It's a million miles, I can't go back there again
But no matter where I go from here
You will be part of me from now on
For every door that opens up
When another has to close
You got to trust me now
Be strong and let me go
Watch me now as I go my way
The time has come
And I gotta say I'm not afraid
Watch me now, every step I take
I feel stronger, so much stronger
The road ahead is a mystery
Your love is here
Oh and I believe inside of me
Watch me now, I can stand my ground
I will be alright, yes I'll be alright
You were someone who believed in me
When I wasn't even sure of myself
And I always will remember how
You were always there to help
And I heard so many things from you
And I'm ready now to try them out in the world
Though it hurts too much to say goodbye
We both know (We both know)
There's no other way
I will feel your loving arms
When I'm out there in the cold
'Cause all of my thoughts of you
Will still be mine to hold
Watch me now as I go my way
The time has come
And I gotta say I'm not afraid
Watch me now, every step I take
I feel stronger, so much stronger
The road ahead is a mystery
Your love is here
Oh and I believe inside of me
Watch me now, I can stand my ground
I will be alright, yes I'll be alright
You will find me running back sometime
When I really need a guiding hand
We'll be closer than we were before
And I know that you will understand
I know you'll understand
Watch me now as I go my way
The time has come
And I gotta say I'm not afraid
Watch me now, every step I take
I feel stronger, so much stronger
The road ahead is a mystery
Your love is here
Oh and I believe inside of me
Watch me now, I can stand my ground
I will be alright, yes I'll be alright