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And Moody, animals rarely mourn the death of offspring when it is only one out of a litter. The mother probably barely even noticed that her little mutant child didn't show up for dinner.
That's not strictly true. It mostly depends on the species, how that species procreates (does it have one baby, many, lay eggs etc). Many animals reject their babies when there is something wrong with them. It may sound awful but animals know when it's best to let a baby go. I don't distinguish between animals and humans - humans are animals and when you think about it, humans do the same thing, it's just that humans 'justify' it. There is a huge number of abortions for congenital diseases and you'd be shocked at the number of parents the give up their babies because they have some sort of deformity etc. Even then, the parents that do keep their children often wonder if it was better if their child died.
With regards to mourning, you don't give other animals enough credit. Elephants always mourn their dead, certain species of birds will die of loneliness if their mates die, cats will often pine for dead family members. For example, when one of our cats had babies, one of them had severe deformities. The mother cat rejected it and let the baby die but she wouldn't let my mother take it away and kept treating it like it was still alive. My mother finally mangaed to skulk off with the dead kitten and bury it. When she got home, our cat had dug the dead kitten up and was mothering it.
You'd be surprised how smart and emotional other animals can be. People argue instinct all the time, but if that were the case then humans are just as instinctive and I've seen far to many other animals go against their instincts and normal behaviour. I hear also a lot of people saying that humans are different because they're altrustic. I've seen plenty of other animals show altruism. Just the other day, some pukekos (a bird here in New Zealand) that we were feeding would pull off bits of bread to share with other pukekos. Or the lioness who adopted a baby oryx - not only did she go against her instinct to eat it, she also kept away from other lions knowing that they would kill it (lions are very social so it's not normal for them to be alone). You can read an article about it
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As for the deformed kitten. Yes it does seem dubious as this would be something easy to photoshop. But at the same time, I've seen worse so it wouldn't surprise me. Sad that it died but perhaps at the same time, the best thing for it.