By studying a highly social, very hierarchical fish species, cichlids, scientists have now ... more aggressive, and more colorful than subordinate males. They defend territories and court females.

It is “also available at (online) fish retailers from time to time.” A Telmatochromis salzburgeri, or Salzburg’s cichlid, raised in an aquarium. Photo from Frederic Schedel Photos show the ...

Shell-dwelling cichlids are known for their remarkable parental care, raising their young in abandoned snail shells.