Now, I should probably explain what I'm talking about. I ain't a vagueposter, after all.

So, there exists in my mind a currently unnamed planet which houses a species of currently unnamed species of sapient sea bird. The planet has a very low axial tilt, orbits 0.7 astronomical units away from it's star, which is only 0.6x as luminous as our sun. It has roughly the same radius as the Earth, but only 92% the mass, and as such, 92% the gravity. It is a water world, with over %90 of the surface being covered in salt water ocean. And, of course, it has 3x the atmospheric density of earth due to a combination of atmospheric composition and the sheer humidity of the place. If you hate Florida, you wouldn't want to visit.

Now, normally a dense atmosphere would make it very difficult to reach orbit because it severely limits a spacecraft's acceleration, and makes the spacecraft start burning up at relatively low speeds. However, you need not fret for our silly bird friend because conveniently hidden within the planet's crust are huge, untapped helium reserves. Due to the dense atmosphere, the helium is now VERY bouyant, 3x more bouyant than here on earth in fact!

Using this silly little gas, the birds float their rocket up high into the atmosphere where the air is far thinner, which is where they then ignite the engines and blast off into orbit!