我們經常觀察到松鼠以堅果及種子為食，但由於偶爾也會食用肉類，因此牠們被認為是機會主義的雜食動物。然而，在美國一個公園進行的一項為期兩個月的研究發現，加州地松鼠積極捕食加州田鼠等小型囓齒動物，超過 42% 的松鼠與田鼠互動涉及主動捕獵。該研究是一項觀察松鼠的長期研究項目，但過去12年並未記錄到這種行為。

Squirrels are often observed to feed on nuts and seeds, but once in a while they would feed on meat, so they were thought to be opportunistic omnivores. However, a two-month research in a local park discovered the California ground squirrel actively hunts on small rodents like the California voles, with over 42% of the squirrel-vole interaction involving active hunting. the study is a long-term research project observing squirrels, but this behavior was not recorded in the past 12 years.

https://www.independent.co.uk/news/science/squirrel-hunting-eating-meat-california-b2666924.html