I think it's because they never existed...
They werent ever alive!
Yes, a blue whale has been caught alive. In fact, thousands of them have been caught while still being alive.
There is no evidence that unicorns have ever existed.
No, none have been captured alive, but there are photographs of live giant squid.
Not that I have ever heard of.
because doctor who is the best show ever unicorns come out of my butt because that's what people(unicorns) do benedict cumberbatch is sooo awesome
There is no evidence that unicorns have ever existed, mummified or not."Unicorns" were actually single-horned rhinos, which were used as beasts of war in ancient times. They were misinterpreted as a mythical creature.See this related question: Do Unicorns Exist?
The carebears got them. Or they never existed.
No she can't be captured
No
Answer There is no scientific evidence to suggest that any of the creatures you mentioned ever existed. However The Bible states that unicorns did exist. I am not sure what happened to them or if they are still alive today. You can find the references in the KJV Bible in Job, Pslams, and Numbers. It is your decision what to believe in.
The largest animal ever captured and held in captivity is the Killer Whale (Orcinus Orca).