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By Greg Pliska
Answer: OXEN

Images reference sigils of Noble Houses in A Song of Ice and Fire. The number of chimneys on each house indicates what letter to index to. PRESTER ANIMAL PLURAL refers to the House Prester sigil, which features an ox. Giving the answer: OXEN.

ORDER LETTER INDEX HOUSE IMAGE
1 P 1 POOLE Blue plate
2 R 2 FREY Twin towers
3 E 1 ESTERMONT Green sea turtle
4 S 1 STARK Direwolf
5 T 1 TARGARYEN Three-headed dragon (Ghidorah)
6 E 2 CERWYN Battleaxe
7 R 2 GREYJOY Kraken (Clash of the Titans)
8 A 2 GAUNT Three lances
9 N 3 HUNT Deer on pole
10 I 5 LANNISTER Golden lion
11 M 1 MORMONT Black bear
12 A 1 ARRYN Blue falcon
13 L 3 BOLTON Flayed man
14 P 1 PENROSE Quills
15 L 2 CLEGANE Three dogs
16 U 1 UMBER Giant in chains
17 R 2 BRAX Purple unicorn (Twilight Sparkle)
18 A 2 MARTELL Spear and sun
19 L 3 TULLY Leaping trout
SOURCE: http://awoiaf.westeros.org/index.php/List_of_houses