  We perform a detailed study of the decays of the heavier top and bottom
squarks (stop_2 and sbottom_2) in the Minimal Supersymmetric Standard Model
(MSSM). We show that the decays into Higgs or gauge bosons can be dominant in a
wide range of the model parameters due to the large Yukawa couplings and
mixings of stops and sbottoms. Compared to the conventional decays into
fermions these bosonic decay modes can have significantly different decay
structures and distributions. This could have an important impact on the search
for stop_2 and sbottom_2 and the determination of the MSSM parameters at future
colliders.
