This is a creature design that I sketched randomly and really liked. I'm not sure what I'll do with these, but here's the basic concept:

The Klavakk are large, herbivorous land-crustaceans.They are highly specialized for land living, using 2 sets of legs for walking, a third pair as specialized claws for foraging, and the remaining 7 pairs are either vestigial or have been specialized for reproduction. The tip of the tail and the telson has developed into a club the Klavakk uses to defend itself, usually carried over the back in a scorpion-like pose. Klavakk do not shed their skin like other crustaceans, but expand their existing carapace over the top of the old one, and then reabsorp the older carapace in their bodies.

Klavakk are herd animals, travelling in mixed sex groups, led by a matriarch. They communicate in a variety of sounds, chirps and clicks made with their mandibles as well as warning noises made by grinding their internal dental plates together. Klavakk are generally not aggressive and domesticated forms can be quite affectionate, but their size and strength means that even tame ones really should not be approached unless you know what you're doing. Violence between Klavakk is rare as conflict is usually solved with threat displays.

Adult female Klavakk are larger than adult males, reaching 2.5m to the males 1.7m. The female is typically duller in color, where the males are more brilliant. During mating season, herds will amass in open grasslands, where the males will compete for female attention with displays, bopping and waving their clubs and antennae around. the mating takes place back to back, with the female using specialized legs to catch the single egg she lays and wrap it in a protective film after the male fertilizes it. After this, the egg is handed to the male, who carries it in his own specialized set of legs, along with any other eggs he successfully obtains and fertilizes in a bundle.

The male can carry as much as 8 eggs at once, though most males will not obtain that many. Once the eggs hatch, the hatchlings will cling to their father’s carapace, until they are big enough to forage themselves, at around the size of a large dog. In domestic Klavakk it is possible to transfer orphaned hatchlings to a new male, and they will be readily accepted, even if the male has never reproduced.

The young Klavakk travel with the herd, and are protected by the adults. Now that they are more independent, the males take less of an active parenting role, leaving it up to the females whose larger size makes it easier for them to corral and defend the young. If they survive until they reach maturity, the males will during the mating season when the herds come together, go off to find new herds, sometimes every year. The females stay together in the herd.

When faced with a predator, all adults will defend the herd’s young, though the larger females are typically much more aggressive as they have no natural predators once they reach full size.

Domestic klavakk tend to be smaller than the wild ones, and more docile. These are typically kept for their meat, as they are easy to feed and quite tasty. Some people even breed for extra colorful males, to showcase in competitions.

Depicted is a mature male.