Conservation in general isnt the smoothest system, okay, but its bearable in PoE (Plains of Eidolon) and 4T (Fortuna).
There is RNG on what subtype of animal spawns. It doesnt matter in PoE and 4T. What matters here is the quality of the capture, giving low, medium or high standing for a bad, good or perfect capture. Highest ranking animals give in the thousands range of standing. Getting Perfect captures is a valid way of gaining standing in Poe and 4T.
Why it isnt in HoD:
First off, the RNG of the sub-type spawning. The gear item to spawn more rare animals doesnt matter either