The rarest rabbit breed in the world is the Sumatran short-eared rabbit (Nesalogus netscheri), with very few sightings recorded in recent decades. Among domestic rabbits, the American Blue Rabbit and the Golden Glavcot are considered exceptionally rare breeds.
There is no reliable information supporting daily feeding of golden berries to rabbits, and generally, uncommon fruits or berries are not recommended daily without expert veterinary advice due to potential toxicity or digestive issues.
Yes, Silver rabbits, specifically the Silver Glavcot, were historically rare and went extinct in the 1960s in the UK and USA, making them a very rare breed today.
Silver rabbits, such as the Silver Glavcot, are medium-sized rabbits, though precise size details vary and are best confirmed with specific breeders.