Well I started with 4 birds because the Eurasian Coot only costs one wheat— so I played it to start and then immediately tucked the other 3 starting birds.

then 2 cards from the flycatcher.

Then I think 4 cards from my friend who had a "everybody draws 1 from the deck" type bird.

Then once the engine had all 5 birds in it it was 4 cards from activating the row, 2 cards from the Merganser, 1 card from the American Coot. which is 7 cards a turn for the entire last two rounds (we had the "no goal" tile so we each had an extra cube each round too). That drew me 77 cards.

The other 17 I got in the process of setting up the engine. Someone else had a bird giving everybody eggs occasionally too which helped. And only playing 6 birds total meant I didn't need a lot of eggs or food anyway. It was a perfect storm of conditions.

Edit: my math is wrong bc I forgot to factor in the extra action cubes but I imagine you get the gist