Some blue varieties include the Peacock Cichlid, Electric Blue Ahli ... Crayfish aren’t truly fish, despite their name. They are freshwater shellfish that we usually imagine as a deep red ...

Like Oscars, blue acara are tropical fish and require a large tank with ample swimming space and well-maintained water. Firemouth cichlids look exactly as their name suggests. These semi ...

Writing in Current Biology, Parker et al. describe experiments in shell-dwelling cichlid fish (Lamprologus ocellatus) that challenge this conventional view (A. V. Parker et al. Curr. Biol.