Consider the Bernoulli polynomials denoted by $B_n(z)$. Now, start plotting the set of all (combined) complex roots $\mathcal{A}_N$ of $B_n(z)$, say for $n=1,2,\dots,N$ for some enough large $N$. It appears that $\mathcal{A}_N$ branches into several "curves".

QUESTION:Or, does it? If so, what are these curves?

*Request:* Can someone post the complex plot here?