Found this article which refers to the Queen palm nut, which is the nut Makena's post refers to
Now Hear This! Oh, Those Tropical Nuts - Yum!
The Queen Palm Nut Tree
An Avi-Reference Page, creation of Bird Clubs of America - Dick Ivy, Editor
Produces a small nut covered with a soft golden colored fruit twice a year, each tree in its own cycle, so fruit is available all year round. Some parrots in the Tropics choose it as a main diet. Native of Brazil (the Hyacinth Macaw loves them); it grows outside in Florida and Southern California. Who likes them? Macaws, Greys, Cockatoos, Amazons (acclimation for some), other birds. What's it like? Outer cover is sticky, sweet, fibrous, very nutritious and high in palm oil, Vitamin E, A and Beta carotene. Some parrots will chew for 20 min. on just one. The nut inside is small and hard. Most birds can't crack it. If the fruit and nut is hit with a heavy hammer or axe, the birds will eat the little nut inside the shell. Hammer gets sticky. The oil, it appears, is not fattening. If fruit is green, refrigerate it to keep it from drying out. Freeze what you can't use in 2 weeks, for later.