Lumperjack

The lumperjack is a descendant of the hoglump which lives 290 million years PE in the forests of Serinaustra. Hoglumps have now given rise to a whole radiation of terrestrial southern trunkos of varied forms and functions. This medium-sized trunko has evolved a most specialized manner of feeding itself: it enjoys eating green leaves of the dancing trees, but it's not very tall and cannot reach them as the browsing giraffowls can, nor can it climb. It brings the leaves down to its level in a way only a few animals would think to do; by cutting the trees down. 

The flexible flanges on the lumperjack's face, evolved first in the sealump to help pluck vegetation from the seabed and move it into the jaws, are larger than the hoglump's and the small bony projections now large, sharp blades. Using its trunk to grasp the trunk of young sapling trees, the lumperjack lines its flanges up on either side and uses the blade-like "teeth" to saw into the trunk and fell the tree. It can then eat to its leisure near the ground, leaving the felled tree defoliated before moving on to the next. This feeding habit leads to major environmental consequence: northern Serinaustra's forests are now much more open than those further south in the longdark swamp, due to the lumperjack's selective removal of so many young sapling trees, and many such woodlands are open enough that sunlight is bright enough to allow grasses, rather than hardy undergrowth, to carpet the forest floor. 

Lumperjacks are mostly solitary animals, for they don't need numbers for safety: they are not only reasonably fast, but also very  well-defended from predators from both front and back, with not only their sharp saw-like facial weapons but also short, pointed horns along their cheeks and snouts, which can be used offensively and also make biting the head or neck a challenge. Prickly spine-like quills upon their backs and behinds also make biting one there just as difficult. Because they don't need groups for protection, they often only spend long periods of time together to breed. The female takes no part in child-rearing, leaving her egg to the male to incubate in his pouch and moving on to take another mate and repeat the process almost immediately, and so can produce many more young in her life than other trunkos which are monogamous. The single chick spends a year with its father before going off on its own.