Question

what trick did the quails play on the fowler

Answer 1

When the fowler put his net over the quails, the birds put their heads out through the small holes in the net and flapped their wings. After doing this, they flew to the nearest thorny bush and put the net over it. Once again, they put their heads out of the net and escaped from under it. 

Answer 2

All the quails put their heads throughout the net