Monarch butterfly (Danaus plexippus).
These short lived insects migrate to Mexico each year, but no single butterfly completes the return journey. Instead four different generations are born throughout the year and each completes a segment of the round trip. They can fly at between 20km and 40km an hour, and make use of updrafts of warm air called thermals to rise high into the air and slowly glide down. This endangered species has been negatively impacted by herbicides, human disturbances, and predation.