I have a bird house gourd plant and one of the gourds has split in half can you tell me why?

Question

It is about the size of a soccer ball i checked it yesterday the19th it was fine and today the 20th its split almost all the way around

Answer 1

it could have gotten too much water and split to contain the excess amount  

Answer 2

toooo much water

Answer 3

Danno,

When it was made it may not have dried out enough.  Then when the evaporation continued, it split.