Lou Coetzer / Pintailed whydah (Vidua macroura) male displaying to female, Masai Mara, Kenya.

Richard Du Toit / Longtailed widowbird (Eupletes progne) male perched in flowers, Rietvlei Nature Reserve, South Africa.

MD Kern / Palo Alto JR Museum / Black Widow (Latrodectus hesperus) spider walking silhouetted against light, captive.

Richard Du Toit / Long-tailed Widow (Euplectes progne) male in display flight, Rietvlei Nature Reserve, South Africa

Enrique Lopez-Tapia / Thuli Maya Fuyal, widow, in her small room in Kathmandu. In Nepal women who lose their husbands lose their own identity. Are rejected and forced to leave their homes. In many cases, they become victim...

Enrique Lopez-Tapia / Rita Pudel, widow, with her son, in the room that serves as a shelter. In Nepal women who lose their husbands lose their own identity. Are rejected and forced to leave their homes. In many cases, they...

Richard Du Toit / Long-tailed Widow (Euplectes progne) male in breeding plumage, South Africa

Philippe Clement / Western Black widow (Latrodectus hesperus) spider leaving burrow / hole in wall. Arizona, USA

Hans Christoph Kappel / Black widow spider with egg ball (Latrodectus mactans) Europe

Heather Angel / Mother of thousands (Kalanchoe daigremontiana), viviparous growth with vegetative propagation of plantlets on leaf margins. In cultivation.

Nick Upton / False black widow or Cupboard spider (Steatoda grossa) female on the wall of a garden shed, near Wells, Somerset, UK, October.

Nick Upton / False black widow or Cupboard spider (Steatoda grossa) hanging in it web in a garden shed next to an egg sacs, near Wells, Somerset, UK, October. Females can live for up to 6 years and produce three o...