Tadpoles screaming underwater show unsuspected sentience
From ANIMAL PEOPLE, May 2010:
BUENOS AIRES–The ethical significance of the discovery that
tadpoles scream when threatened may take some time to occur to
scientists, ethicists, and animal advocates. A breakthrough in
scientific recognition of animal sentience, the finding took more
than three years just to win widespread notice after formal
publication in a leading journal.
Tadpoles might have been audibly screaming when threatened
for more than 200 million years before Guillermo Natale, Ph.D. of
the National University of La Plata in Buenos Aires, Argentina heard
the multi-note metallic sound emitted by tadpoles of the horned frog
Ceratophrys ornata.