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The beak begins to turn red in May and darkens during November and December. The beak then turns rapidly to black in April and the cycle continues.<ref>{{cite journal|author1=Thapliyal, JP |author2=BBP Gupta |name-list-style=amp |year=1984| title= Thyroid and annual gonad development, body weight, plumage pigmentation, and bill color cycles of Lal Munia, ''Estrilda amandava''| journal= Gen. Comp. Endocrinology |volume=55|pages=20–28| doi=10.1016/0016-6480(84)90124-2|pmid=6745630| issue=1}}</ref> These seasonal cycles are linked to seasonal changes in daylength.<ref>{{cite journal|author1=Subramanian, P |author2=R Subbaraj |name-list-style=amp |year=1989|title=Seasonal changes in the timing of hopping and feeding activities of a tropical bird (''Estrilda amandava'') under natural photoperiod|journal=Proc. Indian Acad. Sci. (Anim. Sci.) | volume=98| issue=2|pages=89–93|url=https://archive.org/stream/indidanacademyof020238mbp#page/n95/mode/1up| doi= 10.1007/BF03179631|s2cid=83953707 }}</ref>
Two ectoparasitic species of bird lice (an [[ischnocera]]n, ''Brueelia amandavae'', and an [[amblycera]]n, ''Myrsidea amandava'') have been identified living on them<ref>{{cite journal|author=Gupta, N.|author2=Kumar, S.|author3=Saxena, A.K. |year=2007 |title=Prevalence and population structure of lice (Phthiraptera) on the Indian Red Avadavat| journal= Zoological Science |volume=24 |issue=4|pages=381–383|doi=10.2108/zsj.24.000|pmid=17867828|s2cid=19494524}}</ref> and a [[Paramyxoviridae|paramyxovirus]] has been isolated from birds kept in Japan.<ref>{{cite journal |title=A new paramyxovirus isolated from an Amaduvade Finch (''Estrilda amandava'') |author1=Matsuoka, Y |author2=H Kida |author3=R Yanagawa |name-list-style=amp |year=1980 |journal=Jpn. J. Vet. Sci. |volume=42 |pages=161–167 |doi=10.1292/jvms1939.42.161 |issue=2 |pmid=7382234 |doi-access=free }}</ref><ref>{{cite journal |author1=Rékási, J. |author2=Saxena, A. K. |name-list-style=amp |year=2005
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