A video has surfaced online showing a "poor" turtle struggling for life after being attacked by a large shark off the coast of Corpus Christi, Texas. The video was taken by Kaitlin Warnke who witnessed the tiger shark battling the small creature in the open water. 

In the video, the shark is seen circling its prey, which thrashes in the water as it tries to swim away to save its life. 

"There is literally a shark, right there,” a woman’s voice says, while another calls out “poor turtle.” Another voice is heard shouting: “This is freaking crazy… Go mother nature.”

The shark is seen making attempts to devour the turtle with its massive teeth. The pursuit ends as the shark takes hold of the turtle in its mouth and swims down.

"The shark would bite it then swim around it and continue this till the shark took the turtle in its mouth to take it under," Warnke said.  "The entire time I was thinking about how amazing this was that I got to see nature in such a raw form. I felt sad that the turtle had to die, but there was nothing we could do to save it."

She added: "My family and I ultimately had to accept the fact that the shark was going to get the turtle either way. It was slightly distressing because we saw an animal in distress but couldn't help him."

Sharks attacking other sea animals are not uncommon as the creatures living in the water battle each day for survival against the predators. Sea turtles are equipped with heavy-duty body armor which sometimes makes it difficult for other animals to catch hold of them with their teeth. But large predators such as sharks can easily slice open the tough carapaces.

Last month, the Virginia Institute of Marine Science (VIMS) took a photo of a massive 14-foot-long shark devouring a 4-foot-long black tip shark, showing the cannibalistic nature of the predator.