Summary:
- Octopuses have a unique reproductive system where the male uses a specialized arm called a hectocotylus to deliver sperm to the female.
- Recent research has found that the hectocotylus arm can also "smell" and detect chemical signals from the female to find the best location to deposit the sperm.
- This complex mating behavior demonstrates the advanced sensory and cognitive abilities of octopuses, which are among the most intelligent invertebrates.