The ornamental design for a rock-like observation blind, as shown and described.
FIG. 1 is an upper perspective view of a rock-like observation blind showing our new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a right side elevational view thereof.
FIG. 4 is a rear elevational view thereof.
FIG. 5 is a left side elevational view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of a door and handle in FIGS. 1 and 2 is included for the purposes of showing environmental portions of the rock-like observation blind and forms no part of the claimed design.