  In this contribution, we report on the discovery of dwarf spheroidals (dSphs)
in the core of the Fornax cluster. Their photometric properties -- like
magnitude, colour, surface brightness -- are very similar to those of Local
Group dSphs. However, at a given total magnitude, dSphs in Fornax seem to be
more extended than their Local Group counterparts. The membership of several
dwarf galaxy candidates in Fornax has been confirmed by surface brightness
fluctuation measurements on deep wide-field images taken with the Magellan
telescope. The analysis of these images also confirms the flat faint end slope
of the luminosity function for dSphs in Fornax which contradicts the expected
large number of small dark matter halos connected to dwarf galaxies in
LambdaCDM theory. Dwarf spheroidals have also been detected in the Hydra I and
Centaurus cluster. A preliminary analysis of their photometric properties shows
that they obey similar scaling relations as their counterparts in Fornax and
the Local Group.
