Every small bird looks virtually the same, every mountain range remains unchanging, and every building is renovated only once every few centuries; in contrast, every portrait subject is unique—with skin tones varying drastically between Asians, Europeans, and Africans. Moreover, birds, mountains, and buildings do not pay photographers; only humans provide payment for their services.
What do you think works better on small birds or mountains than human, AI side ?
What AI training is about birds, mountain, architecture and not or worse for humans ?
Are you talking about masks ?
To those not interested in birds. I’d say people, of all races, are far more similar than all small birds.
But as @JoPoV asks, what exactly are you wanting AI to achieve?