  We investigate topology in lattice simulations of QCD with two flavours of
dynamical Wilson fermions. At various sea quark masses we find reasonable
agreement between results for the topological charge from fermionic and gluonic
definitions, the latter with cooling. We study correlations of the topological
charge with light hadronic observables and find effects in the flavour singlet
pseudoscalar channel. The quark mass dependence of the topological
susceptibility, $\chi$, is in agreement with the leading order small m_pi
expectation, chi=(f_pi m_pi)^2/4.
