According to the search results, orcas, also known as killer whales, are not typically afraid of many animals due to their status as top predators in the ocean. However, there are a few exceptions:

• Great White Sharks: Despite their intelligence and strength, orcas are afraid of great white sharks. This is likely because great white sharks are also apex predators and can pose a threat to orcas.

• Pilot Whales: In some cases, orcas have been observed to be afraid of pilot whales. This behavior is not well understood, but it may be due to antipredator mobbing behavior or the element of surprise.

• Sperm Whales: In one video cited in the search results, orcas were shown to be afraid of sperm whales. However, this behavior has not been widely observed or studied.

Overall, it seems that orcas are not easily intimidated by other animals, but there are a few exceptions where they may exhibit fear or caution.