Groups of feral cats living mostly on urban environments that are supposed to have a community of caregivers backing them, bringing them foods and veterinary assistance. The only thing they do to control the population, according to those caregivers, is the Capture-Sterilization-Return method, that consists in progressively sterilizing the cats in the colony so they don't reproduce and the colony should decrease and eventually disappear. This method is obviously not working because, after decades, cat colonies should be on the brink of disappearance, but they are flourishing.

In my city is specially concerning for me that many are near rivers and the small forested area around the water, where many species of birds should be thriving; I am surprised because there are more species than I could expect in this circumstances. I haven't seen amphibians... Probably ever. One year I heard a frog calling, and that's it. The decline of reptiles is also heartbreaking. I've seen hedgehogs and I recently read that they loose their teeth munching on dry cat food.