This is a bit easy, biology wise, under normal conditions any snake, hogs or otherwise is normally capable of swallowing and digesting a certain size prey item. I imagine they learn individually thru trial and error.

biologically, they have limits, behaviorally, there is a range of individual approaches. That is, each animal does have some degree of "individualism", this allows for survival in varying conditions and supporting conditions do change. All habitats have, ups and downs, wet years, dry years, years when prey is abundant, years when other types of prey are abundant and their main prey item is scarce, etc. All that is normal.

Lastly, like with many animals, prey size increases with levels of hunger. Well known in the world of falconry. Starving individuals, will attach and attempt to consume items much larger then normal.

The last lastly, individuals do make mistakes and pay dearly for them. Best wishes

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