Codruisks are very hostile creatures. While they do tend to ignore most animals when they aren't hungry, especially those under 2'-3' in height or length, they do sometimes kill for fun and tend to target larger creatures, like those in the Panthera genus and Cervidae family.

Codruisks are facultative carnivores. They require meat, but can and will eat plants and fungi if it is the only thing available or they choose to. Meat is necessary for their diet and is their preferred food, but they can digest and survive, but not thrive, on plants and fungi.

When they're hungry, they will eat just about any animal that they can catch and that isn't poisonous. They tend to prefer larger animals with a lot of meat -- like elk and green anacondas --, but will go after smaller ones and those with little meat -- like small rodents and crustaceans. They don't like insects.

When it comes to plants and fungi, when they do eat it they tend to go for fruit the most, but some will eat vegetables with the exception of leafy vegetables, which they have only been spotted eating out of boredom, though even then they mostly just tear it to shreds with their teeth and spit it out. They've been spotted doing that (shredding leaves) to a lot of plants when they are bored. Some will eat the inner bark of certain trees and drink sap from maple, walnut, and heartnut trees too. As for fungi, they will eat mushrooms and some toadstools. They will not eat any other plants or fungi... though that hasn't stopped some of them. Some have been caught biting large flowers and then spitting them out in disgust moments later, or chewing on the stalks of various plants only to spit out the chewed up stalk once they're done.

Codruisks will attack and kill humans.

While there are some that prefer to avoid confrontation, due to temperament or occasionally learning not to come around as they are attacked and driven away, many will go after humans and won't stop till their target is dead. Codruisks have great facial recognition and will stalk humans they recognize and are targeting.

Some of the Codruisks that are less hostile towards humans will stalk groups of traveling humans and human settlements not with the purpose of attacking them, but of stealing from them. Some groups/settlement will even leave out food or toys and trinkets -- like dog toys and pieces of scrap metal that can't really be used for anything but have been polished as best they can to be very shiny and appealing -- for less hostile Codruisks in their area that they know come near the group/settlement in the hopes that the Codruisks will be less likely to attack the group/settlement knowing they have and will give them things they like and may even go after other Codruisks who do try to attack the group/settlement.

Codruisks are not against attacking other Codruisks. While it does vary based on temperament and most Codruisks prefer to simply ignore and stay out of the way of each other, some are hostile towards other Codruisks regardless of the situation.

Groups of Codruisks that seem to live and work together as adults have been spotted, however this is extremely rare. A group of Codruisks is referred to as a gang or wander.

Most often, Codruisks only group up to mate and then quickly go their separate ways. Mothers will raise their kits on their own and till half way through their teen years (15-16 years) before either abandoning them or chasing them away from her territory. Teens will sometimes stay in gangs -- which are typically made up of their siblings and sometimes other teens in the area close to their age -- until they reach adulthood or they'll split up and go off on their own.

Codruisks typically have litters of 2-10 kits. In larger litters (8+ kits), only around half typically survive. They have a gestation period of 300 days.