# On the roots of Bernoulli polynomials

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?

Here is an animation of the zeros of the first $$100$$ Bernoulli polynomials, produced using Maple.
EDIT: As requested by Wolfgang, here is a plot of the real roots for even $$n$$ up to $$200$$.