"After repeated emails, and prompting, I was like fine, I guess you're serious about this," Bergdale said.
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So like any good employee would, Bergdale tracked down the biggest bunny he could find.
"(I) came across Darius, the world's largest rabbit," he explained.
Owner Annette Edwards, in the UK, offered to sell Darius's son, Simon.
So Bergdale's boss in Des Moines wired £415 to Edwards... and an additional £1,400 for Simon's safe transport. That's more than $2,300.
And while Simon, a 3-foot-long Continental Giant Rabbit, hopped across the pond last week, Bergdale drove to Kansas City for pick up.
But just as Bergdale pulled up to the airport, United called him and said "Simon had passed away."
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Simon had made it safely to O'Hare. In fact, United spokesman Charles Hobart says the rabbit appeared fine as he left the plane and as he arrived at the PetSafe Kennel. But then, what looked like a layover nap turned out to be a permanent rest.
Red Door Animal Shelter president Marcia Coburn says flying in a cargo hold with predator animals can be challenging for rabbits.
"It's still going to have that prey animal instinct, it's still going to be scared," she explained.
And that can be overwhelming, even after landing.
"They can die of heart attacks out of fear."
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United said the customer transporting Simon declined to have a post-mortem examination performed, so it's unclear what caused Simon's death.
"We were already for the little guy, the big guy, I guess. We had a pen, we had food, we had hay, we had toys. And everyone was pretty excited to meet him. So I was pretty disappointed," said Bergdale.
According to the U.S. Department of Transportation, in 2016 United transported over 109,000 animals; nine of them died.
Other airlines do transport animals differently.
Southwest and JetBlue both require pets to fly in the cabin with passengers. American Airlines allows animals to fly as cargo.
United's spokesman says he is confident the airline followed proper procedures and says the airline is reviewing the situation.