Strongest Caveman is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

In a wondrous yet different primitive world, you have a shape-shifting saber tooth tiger and a kung fu panda (literally) but when darkness befalls them, only the one who shines the brightest can save them. Follow the talented engineer, Yan Jin who witnessed flying cavemen and yet isn’t the slightest bit disturbed by it since he knows for sure that he himself, is the real caveman over there. Read on as he awakens the ancestral power of the divine fire for the glory of the tribe.