(a) Smallest man-like ape is Gibbon.A gibbon differs from great apes like chimpanzees, bonobos,gorillas, orangutans and humans,and is smaller in size, exhibiting low sexual dimorphism, and not making nests. It has a human-like build and no tail. It seems to lack higher cognitive abilities and self awareness.It also has longer arms,dense hair, and a throat sac used for amplifying sound.