Humans are not the only animals that (in many cases) are attracted by the smell of coffee. This study focuses on ants’ attraction to coffee smells:
“Olfactory behavior and response of household ants (Hymenoptera) to different types of coffee odor: A coffee-based bait development prospect,” Abdul Hafiz Ab Majid, Hamady Dieng, Siti Salbiah Ellias, Faezah Syukriah Sabtu, Abd Hafis Abd Rahim, and Tomomitsu Satho, Journal of Asia-Pacific Entomology, vol. 21, no. 1, March 2018, pp. 46-51.
The authors, at Universiti Sains Malaysia, Malaysia, Universiti Malaysia Sarawak, Malaysia, and Fukuoka University, Japan, report:
In a series of Y-tube olfactometer bioassays, we examined the behavioral responses of Tapinoma indicum (TI), Monomorium pharaonis (MP) and Solenopsis geminata (SG) to various coffee-induced odor stimuli, comprised of extracts from Arabica, Robusta and Liberica….
Arabica extract mixed with sugar (S) elicited a significant attraction from workers of all three species in a balanced competition with either unsweetened Arabica extract or water. These results indicated that coffee, particularly Arabica, was attractive to the foragers of TI, MP and SG…
(Thanks to Neil Martin for bringing this to our attention.)