"The turkey eats the spider."
Translation:Hindi örümceği yer.
It is because 'turkey' is the subject. It is doing the action. The spider is the object because it receives the action, so you have to add the accusative suffix '-i' and write it as örümceği. If you were to say, "The spider eats the turkey" (which would be very scary) you would write, "Orumcek hindiyi yer." I hope this helps.