I haven't been back since taking these photos, but I do remember that a small section of the island was separated off by a hotwire - perhaps to let vegetation recover. On the whole, the vegetation seems to survive remarkably well, but I'm afraid I can't name any of the species. I will have to take even more photos next time I visit.
I don't understand why the other two females, N'jema and Kena have not(to my knowledge) become pregnant so far. Kena is an experienced previous breeder from Barcelona.