  In models where the ultra-high energy cosmic ray problem is solved by
top-down scenarios, a significant flux of ultra-high energy neutralinos is
predicted. We calculate the number of events expected from such particles in
future experiments such as EUSO or OWL. We show that by using the Earth as a
filter, showers generated by neutralinos can be separated from neutrino
generated showers. We find that for many models, observable rates are expected.
