I may well be in a minority of one, but I perceive a HUGE difference between objecting to unnecessary cruelty toward animals on the one hand, as compared with ascribing to them such human rights as a "right to privacy" that they cannot understand or appreciate on the other hand.
Most of us would probably object to the very concept of some unknown cinematographer secretly filming us while in the act of procreation, and if a social "scientist" were to ask me about it, I would be able to tell him/her in no uncertain terms that I would object to such filming. If that same social "scientist" were to wander up north and ask a polar bear if it objected to being filmed in the act from a distance, yon polar bear would probably sniff the wind and wonder how said social "scientist" would taste.