The kinetic empires of Native American nomads by Hämäläinen, P

“…This chapter re-examines the powerful nomadic-equestrian societies in the North and South American grasslands and makes the case for a distinctive imperial formation, the kinetic empire. …”

Musteloid sociality: the grass-roots of society by Macdonald, D, Newman, C

“… <p style="text-align:justify;"> Excluded from the pursuit predator niche by better-adapted early felids and canids, the musteloids exploited other hunting strategies as grasslands proliferated in the Oligocene. Unconstrained by specialised running limbs, lineages evolved to excavate prey (badgers) and enter burrows (polecats). …”