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They don't care they feel that there best chance of getting food, water, multiplying, and killing competition is to stay with other non hostile animals ideally apex predators like humans they can't care they do everything involuntarily the same way you keep your lungs breathing and your heart pumping without actively thinking about it that's the only part of the brain they have

You may want to read this and reevaluate your thinking.

Animals and Human Experience the Same Emotions
"The link between humans and animals may be closer than we may have realised. Research by Liverpool John Moores University (LJMU) has found that our furry relatives may share many of the same emotions that humans experience in everyday life. "
https://phys.org/news/2005-09-animals-human-emotions.html

This article was created by someone who doesn't understand the difference between emotions and feelings those are all feelings they are the chemical effects of any input. humans can take feelings as an input and use our emotions to make choices about it. that is the difference all animals have the same feelings as people they just don't have the emotions that allow them to care about anything. they only use logic based on chemical input.