In July, the southern German city of Ulm transforms its river into a dramatic stage where costumed jousters in boats vie for ...

In a mid-sized lake of Switzerland, a “robust” creature with “slim” bumpy lips swam through the shallow water, or it tried to, at least. But something zapped it and caused it to float to the surface.

Biologist Mike Ross, balanced in a canoe beneath a star-filled sky in central Zambia, slaps the water with a net attached to ...