They are flies that are born of a wasp.
More Indonesian Proverbs:
Nothing is difficult if you're used to it.Indonesian
Different men have different opinions; Some like apples, some onions.
Indonesian
A moth will eat the finest linen.
Indonesian
Calm water does not mean there are no crocodiles.
Indonesian
Don't stay on the dew until the sun reaches its highest.
Indonesian
When you begin to understand the situation, you know you must have been ill-informed.
Indonesian