Chimpanzees show happiness through a "play face" (relaxed open mouth), breathy laughter-like sounds, excited vocalizations (pant-hoots), playful body language like tickling, hugs, and specific gestures like play bows during social interactions.
they attack humans
They normally just take a good look at it... like humans do
happy, hungry, horny, sleepy.
happy
they were happy
Chimpanzees are mammals. Because of that, they have a backbone. Therefore, Chimpanzees are vertebrates.
they were happy
the villagers was so happy
they were happy
they were happy
He was really not too happy.
I would likely react by feeling shy and awkward if people would sing happy birthday to me in a restaurant. I would also be happy that people remembered my birthday and wanted to make it special.