"New theory emerges for where some fish became four-limbed creatures." ScienceDaily. ScienceDaily, 29 December 2011. <www.sciencedaily.com / releases / 2011 / 12 / 111227142628.htm>.

When fish suddenly change color, little photoreceptors embedded deep within their skin keep watch to ensure the color is just right, according to new research. For the first time, scientists have ...

The fish appears to have full control over the reflective regions of its iris and can adjust the color of the reflected light between blue and red in rapid fashion in order to better see its victim.

The Gill-Oxygen Limitation Theory explains the biological reasons that force fish, particularly larger or older ones, to move poleward when the waters in their habitats heat-up due to climate change.