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We present results of measurements of electrical, magnetic and thermalproperties of EuB$_{5.99}$C$_{0.01}$. The observed anomalously large negativemagnetoresistance as above, so below the Curie temperature of ferromagneticordering $T_C$ is attributed to fluctuations in carbon concentration. Below$T_C$ the carbon richer regions give rise to helimagnetic domains, which areresponsible for an additional scattering term in the resistivity, which can besuppressed by a magnetic field. Above $T_C$ these regions prevent the processof percolation of magnetic polarons (MPs), acting as "spacers" between MPs. Wepropose that such "spacers", being in fact volumes incompatible with existenceof MPs, may be responsible for the decrease of the percolation temperature andfor the additional (magneto)resistivity increase in systems with MPs.

Anomalous magnetoresistance of EuB$_{5.99}$C$_{0.01}$: Enhancement of magnetoresistance in systems with magnetic polarons