This definition can be contrasted with that proposed by life-span developmental psychologists: Development is a life-long process beginning at conception and ending at death (Honzik, 1984, p. 309). Development is thus extended to include the whole of life.
A cockroache can live up to 10 days without its head. In fact it doesn't die of suffication but of dehydration.  a cockroach can live up to a week without it's head because â¦it's brain is in its body. 1 person found this useful.
I think as long as your cockatiel gets a good amount of exercise, whether that is from flying or just exploring outside of the cage, and a healthy diet they will live a long, happy life. I've heard the average lifespan is 20-25 years now.