SBI PO Prelims 17 Dec 2022 Shift 1 Paper

Which of the phrases given in the options should replace the word/phrase that is underlined in the sentence to make it grammatically correct? If the sentence is correct as it is given and no correction is required, select ‘No correction required’ as the answer.
A Seychelles giant tortoise, a species previously thought to be a strict herbivore, has been filmed to chase and eating a baby bird in a 'horrifying and amazing' attack, with researchers stating it was the first documented example of deliberate hunting in the wild by the species.