What is the modal verb in this sentence - the herd of hungry cows have easily trampled us.?

The sentence "the herd of hungry cows have easily trampled us" does not contain a modal verb. Modal verbs typically include Words like can, could, may, might, must, shall, should, will, and would. In this sentence, "have" is an auxiliary verb, helping to form the present perfect tense, but it is not a modal verb.