The Native American group that had hunters and gatherers who followed the vast herds of buffalo and relied upon the buffalo for their survival is the Plains Indians. To find this answer, you can use various resources such as history books, encyclopedias, or reliable websites that provide information about Native American tribes and their way of life. By researching the lifestyle and customs of different Native American groups, you can identify which tribes had a deep connection with the buffalo and relied on them for sustenance.