  We explore the chiral aspects of extrapolation of observables calculated
within lattice QCD, using the nucleon magnetic moments as an example. Our
analysis shows that the biggest effects of chiral dynamics occur for quark
masses corresponding to a pion mass below 600 MeV. In this limited range chiral
perturbation theory is not rapidly convergent, but we can develop some
understanding of the behaviour through chiral quark models. This model
dependent analysis leads us to a simple Pad\'e approximant which builds in both
the limits $m_\pi \to 0$ and $m_\pi \to \infty$ correctly and permits a
consistent, model independent extrapolation to the physical pion mass which
should be extremely reliable.
