An acorn is other wise known as an oak nut is a nut produced by the oak tree. It contains a single seed which is enclosed in a touch, leathery-textured shell and has a cup-shaped cupule.
image wikipedia
They measure between one to six cm long and are one to four cm wide.
So can rabbits eat acorns at all and are they good for them to eat?
Unfortunately, rabbits can’t eat acorns at all. Their acidic content is highly toxic as far as rabbits are concerned.
This means that they can make your rabbit sick, so are a food for them to avoid feeding them