I'm lead to believe that there are fruiting trees year round in south america in one part or another. But a redfoot doesn't wander the length and width of South America to find fruit. So it will eat the ripe fruit from within its vicinity, which will be seasonal.
I was reading the other day about one study that suggested a redfoot will wander on average 87metres/95yards within a day within the same vicinity. So foraging in the same area then retreating back to the same burrows for the night, in groups too. So it becomes familiar with that area. This, I thought tallied up with the fact what we all say about a tort sulking in a new enclosure that it's not familiar with.
This is why when I hear folks say, don't ever feed fruit to a tortoise I cringe..in my opinion, by observing personally as well as speakjng with numerous folks, offering fruit as part of a tort diet is not a bad thing...here I will offer watermelon from time to time (one year during peak hydration time I will offer watermelon to the CDT then skip it the next year, etc) the water content is so beneficial..I will also almost daily during the hottest kinth or two offer entire huge organic heads of romaine to each of the CDT who happily consume entire said head and then they graze in their evening outings on what grows in their yards...works well, not only hydrated but a little pleasure as well...
Yes, nature provides a food layout that works well..feast or famine is so accurate for many things in life..