The Guillemot, or Why Did Darwin Have To Sail To The Galapagos When He Could Of Stayed At Home?

Half penguin, half torpedo, they
Can dive forever for their prey
Yet fly as well (or just enough)
To nest upon a rocky bluff
Above the oceanic deep
Where thousands congregate to sleep
In colonies vast and denser than
All other birds yet known to Man.
Each pair then tries to win a ledge
And settles there upon the edge
From which, perforce, their feet must dangle
Which is why their eggs
Are
Shaped
A
Bit
Like
A
Triangle.
The reason? Just think where they're sat:
A little nudge and that is that!
But instead of smashing on the ground
Those pointed eggs roll round and round.
And thus by saving little lives
The Guillemotic race survives.