Similar to the raider camp buff I recently suggested, the level cap was 70, but the last unit we get is 25, so we'll not only change the scaling but have a sort of evolution to them up the the legendary versions.
Tens-teens, baby animals:
Buffed to current adult stats, all bar the sandworm are non-nano and don't need lumber to heal, raptor/boar could maybe have current health but a little higher dodge, sandworm has acid spray removed
Late teens-early twenties, adult animals:
New attacks:
Raptor, -triangle shaped X
X X attack
Boar-a charge that damages unit and one behind it, potential with half damage, highest defence of adults
Mammoth-trample hitting targets in a small radius
Sandworm- as is
Thirties-Elder/matriarchs:
Raptor- lunge attack (precise firing type), swipe now wider
Boar- tusk goar hitting 3 adjacent targets (peircing damage), charge hits entire column
Mammoth- throws a log/rock, trample AoE wider
Sandworm- 2x3 acid spray similar to the enemy elder (potentially make that the unit for visual diversity), slam hits all 3 targets
Legendaries- if added all they def need a nerf.
Nano units:
Young worm (early armor and a decent poison attack + indirect attack)
Imperial boar (right around when tanks come in so they can still hit a soldier behind it)
Adult mammoth (a tank with an indirect attack)
Elder raptor being a well rounded unit