Here, the kanji for the names of the animals "frog" and "snake," as well as the verb "to glare," have furigana, even though the rest of the text lacks furigana.
{jintai ni eikyou wa arimasen} ga hokaku no sai ki wo tsukeneba narimasen 人体に影響はありませんが捕獲の際気をつけねばなりません {There's no effect on the human body}, but [we] should be cautious of [it] when capturing [the ajin].