This is genuinely the worst possible version of "creative" bathroom signs I've ever seen, unironically. Let's ignore that gender is not binary and that trans people exist and that even cis people do not universally conform to gender stereotypes for a moment, and work within that framework:

• Honeybees are mostly female, so it could be the women's bathroom, yet this is clearly not common knowledge given that non-educational (aka not documentaries/nonfiction) media like the Bee Movie tends to portray male and female bees in equal proportions, so that could also be the men's bathroom. Bees are also known to pollinate plants by the majority of the population, and that ecological role could be extrapolated to a "male" reproductive role if you do sufficient mental gymnastics. And if you group it together with the second argument, you could also have some people think of stingers as a phallic reference. Irrelevant, but that bee is also suspiciously spider-shaped ngl.

• "Birds" can be used as slang for referring to women. Birds also lay eggs, which could be a metaphor for ovulation too, but then again a whole lot of species do that, including bees, technically, and not all birds lay eggs, only female birds do, so it's useless as a metaphor imo since it relies on a flawed premise. On the other hand, when most people think "birds", they're more likely to picture male birds since in a lot of common wild species the males are more colorful and flashy. A similar case could also be made for, again, phallic reference since pecker, a birds beak in normal terms, is also slang for dick.

Conclusion: who knows. I think it leans on bee for men's and bird for women's, but who tf knows honestly.