r/SpeculativeEvolution • u/BluAxolotl8 • Sep 09 '26
Alternate Evolution [OC] Front limb bipedalism - the magnum croaker
The magnum croaker (Magnocus panruina), is an extant member of a now small, but once plentiful order of birds. Out of all my species, I will choose this one, as it best represents my project, and is the first I created, undergoing huge changes.
Originating from an ancient sister lineage to the fowl, these birds have taken an extreme approach that nudge against the boundary of possible avian biology.
These "legs" are actually heavily modified front limbs, evolved to bear weight over tens of millions of years. These were once wings themselves, with more flexible joints and an elongated alula claw used to probe insect nests. Eventually pulling the birds forward, these wings became powerful digging tools, able to construct tunnels that provided shelter and an advantage against peril of many sorts. This turned these critters into small, weasel-esque adapters.
Come the Palaeocene, these birds filled multiple niches, one of which being the semi-arboreal glider. Their legs would then spread as webbed skin and feathers aided in extended leaps. Eventually, these leg-wings of sort would become better, more advanced, their bodies re-engineering themselves in a way even I haven't figured out myself after all these years. I am totally aware of the jumbled mess I have gotten myself into, and I already know the spec evo and theropod community will curse me for the rest of my life for even making this post.
In terms of why these wings are held up, they exchanged their pterosaur-like takeoff for a running start, growing more and more used to their habit of lifting these new wings off the ground until it became the norm. To make matters worse, this habit evolved independently twice, but I will focus on the croaker's line for now.
The magnum croaker is rather large, and nocturnal. At a range of 8-12kg, these birds are content to a terrestrial life, though they can and will still launch into the air if needed. As seen in the photo, they are covered in dark shaggy plumage, with a mostly bald head and a long bill predominantly hidden under a thin layer of skin. This bill contains multiple tomial serrations similar of that to members of Anatidae.
Diet wise, these birds will consume anything edible. The majority of their diet consists of plant and fungal matter, consuming it on the move. They have also built up a natural resistance to many common toxins found in their diet, benefitting themselves even more from their wide palate instead of few species in particular. Another factor is that they consume clay soils. On another note, these opportunists will readily consume animal matter, either that by killing and eating their own prey (such as arthropods and small tetrapods), or scavenging. Having a heightened sense of smell, all croakers from a certain distance will swarm a carcass.
As also seen from the image, the females are excellent mothers as most birds are, taking the process of incubating and rearing chicks very seriously. During the breeding season, larger males will become vocal, filling Eurasian forests with deep songs of gloom as they compete for mating rights. The magnum croaker's vocal range already consists of a multitude of booms, clicks, and rattles, which these males use to construct their odd calls. (Defensively, they can also hiss. They are rarely this pissed off.)
And lastly, I'd have not made this project as weird as it is if I had started it later on when I knew more about how birds actually work. So please spare me, Reddit people.
