"upon the whole the  behaviour of these animals was so orderly and rational that I concluded they must be magicians."explain this statement with examples from the text.

Dear Riya,

A possible way to approach this question can be -
The intelligent manner in which the two horses behaved with each other and with Gulliver made him think that they were magicians who had transformed themselves into horses. They observed Gulliver carefully and were then involved in a deep discussion just like intellectual creatures.   

Regards,