Flying sucks

That's the title of this graphic...

Found this website of really cute but cynical graphics... ha!

Yes, the 'Run, no cook' post has one of her graphics too...

Here's another one....

and this one.....I m trying to figure out what this drawing means.....

Coz 'they' sprout out when you are very young and drop off when you get old?
Coz 'they' eat everything?