  We show that Ce- and Yb-based Kondo-lattice ferromagnets order mainly along
the magnetically hard direction of the ground state Kramers doublet determined
by crystalline electric field (CEF). Here we argue that this peculiar
phenomenon, that was believed to be rare, is instead the standard case.
Moreover, it seems to be independent on the Curie temperature $T_\mathrm{C}$,
crystalline structure, size of the ordered moment and type of ground state wave
function. On the other hand, all these systems show the Kondo coherence maximum
in the temperature dependence of the resistivity just above $T_\mathrm{C}$
which indicates a Kondo temperature of a few Kelvin. An important role of
fluctuations is indicated by the non-mean-field like transition in specific
heat measurements as well as by the suppression of this effect by a strong
Ising-like anisotropy. We discuss possible theoretical scenarios.
