What year did miners start using canaries?

What are the predators of the Hornbill birds? What kind of beak does a kookaburra have? Are Eagle pellets as useful for dissecting as an Owl's and why or why not? Is a bird's egg leathery? What eats humming bird? Why kites and eagles flying without flapping their wings? Do red tailed hawks eat bugs yes or no? Are Andean Condors endangered? What did Isabella Bird discover? Do hawks eat ostrich? How bats use echolocation to see where they are going? What is the Portuguese word for 'cat'? Are love birds soft bills? What is rhyming word for smooth hen? What do duck balls look like? Does dried rice kill ducks? What type of sea gull is brown and white? Which bird adored as a symbol of long life? Are scaup and blue bill the same? Do timberwolves eat duck?