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Infanticida
Kati does what she has to do to raise at least the other three chicks. Unfortunately, she does it in a way that is unbearable for us humans.This video is intended for ornithologists and other intrested. It is not intended for people who think they can skip their hatred of these animals.We humans take the habitat of the animals and force them, to do so. As we can see, storks are not able to kill their chicks. In the end, the chick died of severe injuries.
White Storks Ciconia ciconia parents were observed to kill their smaller chick in 9 out of 63 nests observed during a threeyear study. Infanticidal parents were caring for larger broods and laid larger clutches than noninfanticidal birds. Males killed the chick in 8 out of 9 cases. Victims were born from the lasthatched egg in 4 and 5egg clutches, they were the lightest in their brood and grew at lower rates than their nestmates during the days preceding their elimination. The lasthatched nestlings in 4chick broods had lower prefledging survival rates than their elder sibs. Potential victims contributed a low fraction to parents' reproductive output, and 4chick broods were especially costly to raise because parents provisioned them both more frequently and for longer nestling periods. Hence, the presence of an extra chick seems to lower the benefit/cost ratio to parents rearing a large brood once its elder siblings have hatched successfully. If nestlings do not compete aggressively for food, parents would be selected to eliminate the extra chick themselves. This hypothesis could provide an explanation for the existence of parental infanticide also in other species.
EDIT! the source: https://www.jstor.org/stable/3676447#....

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