Officers make an appeal for information following the crash on Wednesday afternoon.
The four pythons were rescued after they were found abandoned in North Lincolnshire.
The reduced speed limit has been enforced on a busy stretch of road to cover a dangerous junction.
A father who has been diagnosed with Parkinson's disease made the ascent with his son for charity.
Experts say the bird built his strength, in the days up to take-off, by "helicoptoring" his wings.
