Actually this is supposed to happen, I had this prob when my graphics settings are low in Zt 2 without any Ep(s) itself! Now if you look carefully inside downloads\zootycoon_com_zt2_1033\1015_1.0\ and open Leopard and Dummy.z2f, in entities\units\animals\LeopardBlack there is a dds file called LeopardBlack_Adult_Gloss, deleting this will fix this prob I think!
[modnotice=RedNotDead]please do not post about deleting files and then say i think. If you have not tried it out yourself with no ill effects then do not say to tothers what you think may work. This could ruin the game for them[/modnotice]