Marie Read / Ruby-throated Hummingbird (Archilocus colubris), male flying in to feed from cardinal flowers (Lobelia cardinalis) New York, USA. August.

Marie Read / Northern cardinal (Cardinalis cardinalis) male perched amid snow-covered branches, New York, USA, February.

Alan Murphy/ BIA / Northern Cardinal (Cardinalis cardinalis) male and Pyrrhuloxia (Cardinalis sinuatus) male fighting, Texas

Alan Murphy/ BIA / Northern Cardinal (Cardinalis cardinalis) female flying, Texas

Donald M. Jones / Pyrrhuloxia (Cardinalis sinuatus) male feeding on Ocotillo (Fouquieria splendens) flowers, southern Arizona

Alan Murphy / Pyrrhuloxia (Cardinalis sinuatus) male, Texas

Alan Murphy / Northern Cardinal (Cardinalis cardinalis) male, Texas

Alan Murphy / Pyrrhuloxia (Cardinalis sinuatus) female, Texas

Jeff Rotman / Symbiotic emperor shrimp (Periclimenes imperator / Zenopontonia rex) living in the gills of a spanish nudibranch (Hexabranchus sanguineus) Red Sea, Egypt

B&S Draker / Northern Cardinal (Cardinalis cardinalis) male eating Possum Haw Holly (Ilex decidua) berries. Bandera, Hill Country, Texas, USA.

Steve Gettle / Northern Cardinal (Cardinalis cardinalis) male, Brighton, Michigan

Rolf Nussbaumer / Northern Cardinal (Cardinalis cardinalis) male feeding young Brown-headed Cowbird (Molothrus ater) New Braunfels, San Antonio, Hill Country, Central Texas, USA