What is the union territory of west bengal?
There are a number of ways climate change may contribute to drought. Warmer temperatures can enhance evaporation from soil, making periods with low precipitation drier they would be in cooler conditions.
Cosmic microwave bacground radiation (CMBR) and doppler Redshift.
They are quick and easy to set up and take up little space on a wagon or other modes of transportation. This is important because herders are constantly moving their livestock from place to place and cant stay in one area for too long.