system
Given the following post, respond as if you're commenting on Reddit:
human
What is the furthest traveling organism in proportion to their size?

How far do they go in respect to humans and does anything come close to lunar or even mars travel? If so what are their adaptations?
gpt
The monarch butterfly is probably the most relevant especially when comparing lifespan to distance. They have multigenerational migations. 

Generation 1 monarchs are the offspring of the monarchs who overwintered in Mexico. Each successive generation travels farther north. It takes 3-4 generations to reach the northern United States and Canada.