New Details on Death of Baby Bison at Yellowstone National Park

Newly released video shows the calf struggling to make it across a river and keep up with its herd.
2:40 | 05/19/16

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Transcript for New Details on Death of Baby Bison at Yellowstone National Park
We're back now with new details on the death of that baby bison at yellowstone national park. It has sparked so much outrage. Park offs are now explaining why they had to euthanize the bison after tourists put it in their van. ABC's Neal Karlinsky has the story. Good morning, Neal. Reporter: Lara, good morning. A lot of strong feelings about this one. Once again people getting too close to wildlife. This time with tragic results. This morning new video reveals the story behind the baby yellowstone bison captured in this controversial photo put in the back of a visitor's SUV. This video taken by a different visitor shows the little calf earlier struggling to make it across a river and keep up. Come on, baby. Reporter: Later it approaches the visitors in distress trembling and sticking close to a car. Go, little Buffalo. It was really horrific to see that little Cal laying in the road. Reporter: It is believed to be the same calf that another visitor packed into his SUV and took to a field office for help. We now know the result, the young bison was rejected by its herd and had to be euthanized. The man in trouble for trying to help the little calf has been identified as sahmus kazaam and was issued this for disturbing wildlife and told a wildlife officer he feared it would be roadkill and was staying clothe to his engine for warmth but the picture and resulting tragedy exploded on social media. Even an online petition, justice for baby bison. Yellowstone's own Facebook page has 14,000 comments and counting. People outraged the bison was put down. Park officials responding that they don't have the facilities to quarantine a young animal and check for disease or to care for a bison that can't fend for itself. It's illegal to interact with wildlife at yellowtone but that hasn't stopped visitors. Some seriously injured in just the last year getting too close to take selfies of all things. Natalie Kinsel who took the video of the baby calf said people shouldn't judge the man who put the calf in his SUV too harshly. It was out of the goodness of their heart. Reporter: The man would took the calf knows what he did was wrong. He wouldn't do it again but if there was another occasion, he would call wildlife officers for help. Lara. Yep. Learn from that. Just wish something could have been done. Wish he could have been brought somewhere, reintroduced into the wild. It's a shame. All right, Neal, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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