The order of carnivorous mammals includes the marten, the pika, the fox, why?

The group of predators includes animals – classic carnivores that hunt mainly vertebrates. Analyzing the “menu” of the listed animals, it can be seen that only the marten and the fox belong to the order of predators, but the pika does not, or, more precisely, it is from the order of Lagomorphs.
Martens feed on rodents (rats), small birds, and bird eggs. The fox feeds in a variety of ways: more than 400 species of animals, and besides that, several dozen species of plants. Pikas feed on grasses, mosses, leaves of shrubs, lichens.