文中25~26行 Such thorough carcass consumption implies to the researchers either that prey availability was low, at least seasonally, or that there was intense competition over kills and a high rate of carcass theft due to relatively high predator densities. 这句intense competition over kills指捕杀猎物过程中得吧,后面得due to relatively high predator densities修饰是intense competition over kills and a high rate of carcass theft还是仅a high rate of carcass theft?