I found this big hornet’s nest on my father in law’s durian tree. Hornets are dangerous insects, therefore it is wise to stay at least 10 meters away if encounter a hornets nest.
Like bees, the hornet stings is very painful and to someone who is allergic to the venom, death may occur from anaphylactic reaction.

The hornets nest on my father in law's durian tree. Closed up of the hornet collecting wood to build its' nest.