Goosebumps
Bird skin is goosebumps. Makes sense, since a goose is a bird and a bird's skin is bumpy.
とりはだ
The reading is the individual vocab readings of the two kanji, 鳥 and 肌.
「ゴキブリ」という名前を聞くだけで、鳥肌が立ちます。
I get goosebumps just from hearing the name "cockroach."