AnimalsBirds
Some gas utilities find leaks by watching turkey vultures.
The additive that gives natural gas its smell resembles decay, so circling birds mark the break in the pipe.
Source
This fact is written from the English Wikipedia article it links to, so you can check every word in one tap. Fact Drop rates that source 4 out of 5 for credibility, and the rating travels with the fact on the back of its card in the app.
More animal facts
Animal facts are the ones people repeat at dinner. Sharks are older than trees, a headless chicken lived for eighteen months, and vampire bats remember who fed them. Every fact here links to the reference it came from.
- Crows remember the face of a person who wronged them, and pass the grudge on.
- A penguin proposes with a pebble.
- Pigeons shown microscope slides of breast tissue learned to sort cancerous from healthy samples.
- You have been feeding dinosaurs in the park.
- A tagged bar-tailed godwit flew from Alaska to Tasmania without landing: about 13,560 km in eleven days, with no food, water or sleep on the ground.
- An owl's eyes are tubes locked into its skull.