Enrichment is all the means put in place by zoological parks to ensure an appropriate environment in terms of stimulus, complexity and variability for captive animals. There are different types of enrichment: food, structural, cognitive, social, olfactory etc. This allows them a certain degree of choice and control over their environment, and thus an improvement of the conditions in captivity and well-be psychological. It is recognized that getting closer to the diversity and frequency of wildlife behaviours is a way to increase this well-being. So I guess this is why PlanZoo team prioritize enrichment feeders over regular meals, because this is how it is done in real zoos nowadays and this is how it should be done. Researches have proven this. Animals need to search for their food, just like in the wild.
Did you put enough enrichment items in your habitats for all your animals? You can check that out in the enrichment tab of an animal. If zookeepers do not fill the food enrichment items, then you may not have enough staff in the workzone or these are not accessible? Please check this out and let us know! I wish there were tips and more explainations about enrichment mechanics ingame!
This is interesting, I am looking forward to your feedback, because I take good care of the amount of food enrichment I put in my habitats according to the number of animals (and babies) inside, and I never encountered this issue since launch. So this looks like a bug if you did everything right.