From 2speccers2tools wiki

The Railclong is arguably more exotic than its ancestor, a last-ditch hope by the Clongus, however it is also one of the nails in the coffin for the Clongus, not the final nail in the coffin though, not yet.

The Railclong likely is able to exist due to the abundant magnetite deposits where it lives, as it slurped up mud some of it was bound to be magnetic, it couldn’t use this before but when it developed a primitive electric organ its setup became quite familiar: the Railclong has a railgun. This of course is very expensive to use and thus the Railclong has evolved to never miss, with huge eyes and even a few primitive ocelli on the tip of its snout, it can near-perfectly track prey and if possible aims for whatever looks like an eye so it hits the head (this would make it hilariously vulnerable to the stupid eyespot thing though).

To ensure that its ammo is effective the Railclong has developed a simple internal mould derived from hardened walls of the esophagus, which moulds the bullets into a sharp ‘lemon’ shape, allowing for maximum speed and penetration, as mentioned earlier these bullets also tend to have a significant magnetite content, which the Railclong can now taste so that it can select the most magnetic areas to eat mud from and make bullets. Because it no longer just randomly eats mud the Railclong does now go through the effort to drink from liquid water so it is properly hydrated.

When ready to fire, the Railclong charges up its electrical organ to create a fairly strong electromagnetic field within the snout, this causes the magnetic bullet to go ridiculously fast before it is fired out, mostly retaining the speed if conditions are favorable, in a perfect hunt the Railclong’s bullet will penetrate the eye and into the brain from there, killing or at least disabling the unfortunate victim, because of its unwieldy snout proportions it can no longer slurp up prey without great effort and thus simply secretes enzymes onto the prey and directly absorbs the slurry, this is convergent with its relative the Blundergus in both reason and method. Due to more competition from better adapted descendants, the Clongus is even rarer than before though not yet extinct.

A railclong having ‘shifted gear’, because the snout is mostly hollow it is much lighter than it appears.