Question: Do gray whales have to worry about being eaten by other whales?, Answer:Yes, Description of Gray whale: species of mammal, Fact1: Gray whales do die of natural causes and are sometimes preyed upon by killer whales. , Fact2: Pods of killer whales have been known to attack gray whales throughout their range, especially young animals during migration.
Step1: What preys on grey whales?, Step2: What are true whales?, Step3: Do any of #1 meet the criteria for #2?, Wikipedia page for step 1: wiki: Grey Whales, Wikipedia page for step 2: wiki: Whales, Wikipedia page for step 3: , not_definitive_answer: False, incorrect_answer: True