The best replacement for sperm whale is giant squid.

The best alternatives to sperm whale are rated as following:
★★★★★  giant squid
★★★★  blue whale
★★★★  orca
★★★  megalodon
★★  killer whale
★★  colossal squid
★★  squid
★  great white
★  great white shark
★  white shark
★  humpback whale
  whale shark
  right whale
  giant squid pictures
  giant squid video

Your alternative for sperm whale is not listed? Suggest!
Speaking about sperm whale, one probably shouldn't forget about giant squid.

Other search terms related to sperm whale and their ratings are:
★★★★★ giant squid
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