Aye-aye

Their peculiar external appearance encourages the Malagasy people to consider them bad omens.

An excerpt from the article 26 facts about Aye-aye
There is a saying “Mangatambo hita, miseo tsy tsara”, which means that seeing the “beast” brings bad fortune. Combining that with their long, thin middle finger pointed at humans, results in aye-ayes getting killed by superstitious inhabitants of the island.