I am afraid Orca will win regardless fighting in deep water or in shallower river. This … The bull sperm whale thing is a myth actually. An orca can definitely take down a whale the same size or smaller, but grown sperm whales … Small orca packs (3-5ish) 1/10 an adult bull sperm whale (with casualties) maybe 7/10 a cow (sperm whales are very sexually dimorphic, orcas not that much). Sperm whales do not have many predators, killer whales (orcas) are known to have attacked sperm whales and occasionally sharks; but since the early 1700s by … "Killer whale attacks on sperm whales have rarely been observed or reported," said Robert Pitman, a marine ecologist with NOAA's Southwest Fisheries Science Center. It should also be noted that there have been incidents where bull sperm whales organized to help fend off attacks by killer whale pods. If you consider being rebuffed, being discouraged or having a temporal set back, yes, orcas can be “defeated” by some of the larger whales. For this fight, I'll assume that the killer whale is solitary (extremely unlikely) and that the specified mosasaur is Mosasaurus hoffmanni. The sperm whale (Physeter macrocephalus), on the other hand, may not be the biggest whale, but it has the biggest brain to have ever existed on Earth. The orca's (Orcinus orca) size of up to 31 feet (9.4 meters) makes it the largest dolphin. Orcas versus sperm whale pod. Killer whales are formidable opponents of the great white — long thought to be kings of the ocean — according to a 2019 study published in Nature. 1 on 1 no chance versus a male, maybe 1-2/10 a female. A mosasaur? Depends on what you consider a defeat. In addition, Orcas do attack and kill adult sperm whale cows, which have teeth, far superior numbers and organization, and reach 36 feet in length and 27 tons. They are also known as orcas and can grow to 31ft (9.5m) long. Orcas bully sperm whales freely. I’m eventually going to cover this topic in my blog, but I will say my opinion on this issue: First, size: Livyatan will vary in size between cows and bulls like modern whales, but C. megalodon will vary even more. They have around 50 conical teeth, which they use to … A comparison chart of whale sizes helps put it all in perspective! Depends on the selection. Despite their name, killer whales are actually dolphins. Here a solo female orca swims right up to the pod which has a bull and bites one of them before harassing them for 20 minutes while the sperm whales do nothing but enter a defensive formation. The preferences that killer whales have for sperm whales in the Pacific might have led female sperm whale units to group together for safety. 1 on 1 no chance versus a male, maybe 1-2/10 a female deep water or shallower. €¦ Despite their name, killer whales have for sperm whales organized help. A whale the same size or smaller, but grown sperm whales in the might... 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