Hmm.
When you start trading 800 coin bombs for your seventh, eighth, and ninth birds, when you don't even need a single one for the ending, you realize that you really wish the author had put SOME kind of limit on it. With the ultimate rod, you cover a LOT of airspace. Either make it so that ONLY the lower two lures (small and medium) catch birds, or only one bird can be caught. I lost several thousand points off of my finishing score because of the birds.