|Lights on termite mound, Pantanal, Brazil|
The green lights we saw were the glowing abdomens of Pyrophorus, or click beetle, larvae which burrow into the edges of termite mounds and use the lights to attract other insects - as prey. Apparently some of these glowing beetles are found in the US, in Texas and Florida.
This was a 30-second exposure at ISO 2000, so there is little depth of field, and a fair amount of noise. But it was good enough to at least capture this rarely-seen behavior - and learn a new story.
Nikon D3, with 24-70mm lens