Love at first sight, underwater style: this sea snake might've evolved large eyes to spot potential mates better!

Forget the old saying, love ain't blind for the aipysurine sea snake. These dashing gents of the Indo-Pacific, it seems, are all about taking a good, long gander at their potential partners before making a move.

A team of four researchers recently uncovered that the male aipysurines have, you guessed it, big, beautiful eyes for a very specific reason. They reckon these peepers aren't just for looking pretty – they're actually an evolutionary bonus that helps these love-struck lads find their perfect match in the vast, watery expanse.

Now, aipysurines are a pretty fascinating bunch. These venomous snakes used to call land their home, but millions of years ago, they took a plunge and adapted to life in the Indo-Pacific. While they still need to pop up for air like a chatty bloke at the pub, they've become real masters of the marine realm, hunting fish and shellfish amidst the coral reefs.

But finding a bit of snake-on-snake romance proved a bit trickier than they thought. Imagine a dimly lit underwater bar – perfect for a bit of flirtation, right? But scent, a landlubber's secret weapon for sniffing out a sweetheart, is useless in the watery world. Enter the big eyes.

After poring over 400 specimens of six different types of these venomous charmers, the researchers figured out that as these snakes made the switch to the sea, the males probably developed jumbo-sized eyes to make up for the uselessness of scent-based tracking. Now, their eagle-eyed vision lets them spot potential partners from miles away, making the whole dating game a bit easier.

But the researchers reckon there's another reason for these impressive peepers: dinner! In the ever-changing marine environment, having a clear view is crucial for hunting down fish and shellfish. The bigger the eyes, the bigger the feast, as they say.

Meanwhile, the aipysurines also show off a bit of dimorphism, meaning the ladies are bigger than their male counterparts. Maybe it's to carry more babies, or perhaps it's something to do with the ladies chowing down on a more nutritious diet than the blokes.

Interestingly, the researchers also point out that small size in males is pretty common in species where physical competition for mates isn't a major factor. In the case of aipysurines, finding each other in the vast ocean seems to be the biggest challenge, and good eyesight seems to be the key to unlocking that snakey love story.

The findings of this study have been published in the journal Royal Society Open Science.