Ample Islamic References about sex with animals being forbidden!
I have done the image capturing and English translations below to the best of my ability. The Arabic words that I did not know the meaning of, I quoted them in the English translation.
Also, please be advised that Arabic is read from right to left.

Translation: Whoever comes unto an animal, kill
him and kill it with him.
Narrator: Abu Huraira and Ibn Abbas.
Validity and Authentication: Authentic and undisputed.
Reference: Sahih Al-Jami'a, page or number:
5938.

Translation: Whoever comes unto an animal, kill
him and kill it with him.
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and undisputed.
Reference: Mushkat Al-Masabeeh, page or
number: 3509.

Translation: Whoever goes in unto (has sex
with in other words in Arabic) an animal, kill him and kill the animal.
Narrator:
Abdallah Ibn Abbas.
Validity and Authentication: Chained by Amru bin Abu-Amru. Both disputed it. But
Yahya bin Ma'een authenticated it.
Reference:
Nile Al-Awtar, page or number 7/288.

Translation: Whoever you find unto (having
sex with) an animal, kill him and kill the animal with him.
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and
undisputed.
Reference: Sahih Al-Tirmithi, page or number:
1455.

Translation: Whoever you find unto (having
sex with) an animal, kill him and kill the animal with him.
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and
undisputed.
Reference: Sahih Al-Jami'a, page or number:
6588.

Translation: Cursed is he who profanes his
father. Cursed is he who profanes his mother. Cursed is he who kills (an
animal or sacrifices an animal) to other than Allah (note: In
Islam, Muslims are forbidden to eat a meat of an animal that was killed for a name other
than GOD Almighty's such as an idol or anything else. See Noble Verses 2:173, 5:3, 5:4, 6:118, and many others). Cursed is he who alters "takhoom" (I don't know the meaning of the word) of
earth. Cursed is he who "kammahu" (I don't
know the meaning of the word) blind person from a path.
Cursed is he who goes in unto (has sex with in other words in Arabic) an
animal. Cursed is he who does what the people of Lot did (sodomy; the
people of Sodom and Gomorah).
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and undisputed.
Reference: Musnad Ahmad, page or number
3/266.

Translation: Cursed is he who profanes his father. Cursed is he who profanes his mother. Cursed is he who kills (an animal or sacrifices an animal) to other than Allah (note: In Islam, Muslims are forbidden to eat a meat of an animal that was killed for a name other than GOD Almighty's such as an idol or anything else. See Noble Verses 2:173, 5:3, 5:4, 6:118, and many others). Cursed is he who alters "takhoom" (I don't know the meaning of the word) of earth. Cursed is he who "kammahu" (I don't know the meaning of the word) blind person from a path. Cursed is he who goes in unto (has sex with in other words in Arabic) an animal. Cursed is he who does what the people of Lot did (sodomy; the people of Sodom and Gomorah).
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and undisputed.
Reference: Sahih Al-Jami'a, page or number
5891.

Translation: Whoever goes in unto (having sex
with) an animal, kill him and kill the animal.
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and
undisputed.
Reference: Sahih Ibn Majaa, page or number:
2094.

Translation: Allah cursed who kills (an animal or
sacrifices an animal) to other than Allah (note: In Islam,
Muslims are forbidden to eat a meat of an animal that was killed for a name other than GOD
Almighty's such as an idol or anything else. See Noble Verses 2:173, 5:3, 5:4, 6:118, and many others). Allah cursed who alters "takhoom" (I don't know the meaning of the word) of
earth. Allah cursed who "kammahu" (I don't
know the meaning of the word) blind person from a path.
Allah cursed who profanes his parents. Allah cursed "tawalli" (I don't know the meaning of the word) other
than "muwaleeh" (I don't know the meaning of the
word). Allah cursed who goes unto (has sex)
with an animal. And Allah cursed who does the actions of the people of
Lot (sodomy). He said it thrice regarding the action of the people of Lot.
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and
undisputed.
Reference: Sahih Al-Targheeb, page or number:
2421.

Narrator: Kill the doer and the one who is
being done (i.e., two males having sodomy), and who goes in unto an animal.
Narrator: Abdallah Ibn Abbas.
Validity and Authentication: Authentic and
undisputed.
Reference: Sahih Al-Targheeb, page or number:
2423.
A lot more Hadiths available here:
18 more Hadiths (Sayings) of Prophet Muhammad, peace be upon him, narrated by his close companions are provided in Arabic in an MS-Word DOC file at:
www.answering-christianity.com/sex_with_animals_forbidden.doc
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