Isn't it amazing that dog breeds like the Chihuahua and the Great Dane can vary so much in size, yet be the same species?
Tortoises can live beyond 100 years, and whales and elephants also have long lives. What's the shortest-lived tetrapod (four-limbed creature with a backbone)?
Besides after hearing a thud on your newly cleaned window, have you ever found a dead bird in your lawn? Why is it so unusual?
Why do we age? Science didn't really start investigating that question until the 1960's.
What insect has the longest life span of them all? Find out on this Moment of Science.
Also, when birds are trapped over and over again through the years, this gives scientists a sense of their lifespan. How else can you know if the cardinal at your bird feeder is the same one that was there last year?