The Mauritius Fody Foudia rubra, a highly endangered species of weaver
(Ploceidae) endemic to Mauritius, was studied from 1989-1993. The plu
mage, various display postures (typical of the family), and seven adul
t and two juvenile vocalisations are described. The diet consisted of
insects, nectar and fruit, Males were in breeding plumage, and breedin
g took place, between late August and early April, although severe wea
ther in February 1992 terminated breeding activity early. The species
appeared to be monogamous and was suspected to maintain a long-term pa
ir bond. Pairs occupied exclusive territories of not less than 0.9 ha.
Both sexes built the nest from the outset, but only the female lined
it. Between breeding attempts, some pairs habitually started but then
abandoned one or more nests. Clutch sizes of two to four were recorded
, three being the norm. Incubation and brooding were carried out by th
e female; the male joined in feeding the young after daytime brooding
ceased. Juvenile dependency appeared to last around two weeks after wh
ich the young were ousted from the territory. The potential productivi
ty of up to three broods per pair per year was not achieved by any pai
r studied because of poor nesting success. A complete moult followed b
reeding. Territorial defence continued throughout the year, and no evi
dence for seasonal movements was seen. Two behavioural features seem u
nexpected: 1) male nest invitation and nest advertisement behaviour ap
peared to be absent; 2) females participated from the outset of nest-b
uilding (including prospecting). These could be explained by the exist
ence of a long-term pair bond, which needs to be confirmed but would n
ot; be surprising in a species that remains on territory all year. Hyp
otheses that could be tested to find a mechanism responsible for the u
nusual features of the fody are suggested. In comparison with other fo
dies studied, the breeding behaviour most resembled that of the Seyche
lles Fody F. sechellarum (also a monogamous, nongraminivorous omnivore
that breeds in solitary pairs in evergreen forest). The annual cycle
was similar to that of other native passerines and most other fody tax
a.