Erratum to: Behavioral Ecology and Sociobiology

DOI 10.1007/s00265-016-2240-x

There was an error in the equation in the original version of this article. The correct equation is:

$$ \mathrm{P}\left(\mathrm{case}\;2\right)={C}_{NL}^{NM2}/{C}_{NL}^{\left(NM1+NM2\right)} $$

Summing over the two independent cases, we finally obtain:

$$ {\mathrm{P}}_{\mathrm{SPtMB}}=\left({C}_{NL}^{NM1}+{C}_{NL}^{NM2}\right)/{C}_{NL}^{\left(NM1+NM2\right)} $$