A 1,354 kilogram car is driving down a highway. The driver suddenly realizes a large animal is standing stationary on the highway in the way of the car. The driver manages to release their foot off the accelerator peddle, but does not have time to hit the brake peddle. The car travelling at 102 kilometers per hour strikes the animal which gets stuck to the car hood. Immediately after the collision the car slows to 61 kilometers per hour.

Given this information, accident investigators are able to determine the mass of the animal as what?

Your answer should be a value in kilograms to zero decimal place precision (whole numbers only).