1. It is extremely rare that three calves are born at one time and the probability of quadruplets is much lower.
2. The contamination by the toxin is extremely rare for a commercially canned product.
3. The family have been diagnosed with the extremely rare heart condition dilated cardiomyopathy, which causes the heart to enlarge and pump blood less efficiently.
4. Sheriff's Deputy Carlos Padilla said the coins were extremely rare, which could make it difficult for a thief to sell them.
5. Although Polydactylism is not particularly rare, it is extremely uncommon for an extra digit on each hand and foot.
6. Experts say the finding is extremely rare since the Jin Dynasty lasted for only 119 years and did not dominate central China.
7. The extremely rare honor has not been bestowed on any general for decades, and has only been awarded 10 times in the country's history.
8. While swimmers and surfers often receive minor bites in Florida waters, officials say fatal shark attacks are extremely rare.
9. In addition, a global economic crisis of this severity is extremely rare.
10. Experts with those groups and congressional committees familiar with intelligence programs say errors should be extremely rare because one vivid anecdote can do significant damage.