Praise be to Allaah.
Firstly: If these birds are a kind whose flesh it is
permissible to eat according to sharee’ah, such as sparrows, chickens and
ducks and so on, then their faeces is taahir (pure). The same ruling applies
to any animal whose flesh may be eaten, such as sheep, cows, horses and so
on. There is a great of evidence that the urine and dung of animals whose
flesh may be eaten is taahir, such as the following:
1 – The basic principle concerning all things is that they
are taahir, and there is no saheeh shar’i evidence to suggest that these
things are naajis (impure).
2 – It is proven in al-Saheehayn that the Prophet
(peace and blessings of Allaah be upon him) told a group of people who came
to Madeenah and fell sick to drink the urine and milk of camels. If the
urine of camels was impure he would not have told them to drink it, because
it is not permissible to use haraam things as medicine.
3 – It is proven in Saheeh Muslim that the Prophet
(peace and blessings of Allaah be upon him) was asked about praying in
sheep pens and he said: “Pray in them for they are a blessing.” And he did
not tell the one who prayed there to avoid the urine and dung, even though
he would usually find some of that.
There is a great deal of other evidence, which was discussed
at length by Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him).
See Majmoo’ al-Fataawa (21/542-586).
Ibn Qudaamah (may Allaah have mercy on him) said in
The urine and faeces of animals whose flesh may be eaten is
taahir. … Maalik said: The scholars do not regard the urine of animals whose
meat is eaten and whose milk is drunk as najis (impure). … Ibn al-Mundhir
said: Everyone from whom we acquired knowledge among the scholars is
unanimously agreed that it is permissible to pray in sheep pens, apart from
al-Shaafa’i who stipulated that it should be free of dung and urine. End
It says in Fataawa al-Lajnah al-Daa’imah (6/414):
The urine of animals whose meat may be eaten is taahir, and
if it is used on the body for some purpose, there is nothing wrong with
praying in that state. End quote.
But if these birds are of a type whose flesh may not be
eaten, such as birds that have talons, like falcons, then their faeces is
najis and there is no difference of opinion among the scholars concerning
that. See al-Mughni (2/490).
As it is proven that the faeces of birds whose meat may be
eaten is taahir, then it does not have to be washed off if it gets onto
one’s clothes or body, or on the carpet, and there is nothing wrong with
praying in these clothes or on this carpet.
But you should advise your mother to allocate a special place
for these birds so that they will not bother other members of the household,
because even if this faeces is taahir, it is still off-putting to people.
And Allaah knows best.