So far in my game, the cheetahs have been the cutest in terms of social interaction, in two different zoos. Simply adorable!
Mommy grooming the cub:
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Cub playing with daddy:
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I have also noticed that they often go swimming together which looks quite lovely. Once, directly after the birth of the babies, the mother just accompanied them all to the water and they seemed to have their family time there. I noticed the same in the bengal tiger habitat.
Additonally, after I added a new female tiger to my grown-up male, she went directly to him and they seemed to introduce themselves. Afterwards, they went off through the habitat together. It was no mating interaction!
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To me it seems that the cats have the most elaborate interactions, but maybe this is just a false impression because I watch them the most
I can also remember lion cubs playing with the father's tail and tipping over, really cute but unfortunately not caught on camera.
Also my red lemurs like to... I don't know, whisper in each other's ears or something:
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And finally my heart melted yesterday when I saw the red pandas. I didn't manage to take a picture in the right moment, but one was jumping onto the other and then rolling over:
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I'll edit the habitat sizes later, but all were above the minimum and the general welfare of all animals was very good.
Edit:
Cheetahs in zoo #1: 2500 m2, 1 male, 1 female, usually 1-4 cubs
Cheetahs in zoo #2: 1016 m2, 1 male, 1 female, 2 cubs
Bengal Tigers: 3540 m2, 1 male, 1 female, usually 1-2 cubs
Red Ruffed Lemurs: 2228 m2, 1 male and up to 9 females, sharing the habitat with a similar-sized group of ring-tailed lemurs and guests can walk through the habitat.
Red Panda: 588 m2, group of 3-5 adults (I know there should only be two, but they are too cute and their welfare is between 80 and 95)