  We report on a correlation between virial mass M and spin parameter lambda
for dark matter halos forming at redshifts z > 10. We find that the spin
parameter decreases with increasing halo mass. Interestingly, our analysis
indicates that halos forming at later times do not exhibit such a strong
correlation, in agreement with the findings of previous studies. We briefly
discuss the implications of this correlation for galaxy formation at high
redshifts and the galaxy population we observe today.
