飛鼠 is read as ひそ (hiso) and means bat (animal).
ひそ
hiso
とびおりる
to jump down
ひこうき
airplane
ひこう
to fly
ひこうじょう
airfield
とびだす
to appear (suddenly)
ひやく
leap
とぶ
to come flying (of a punch, kick, etc.)
とばす
to attack (e.g. with a leg manoeuvre)
とびこむ
to burst in
ひこうし
pilot
とびだし
something that leaps or thrusts out
とびきり
jumping and slashing (e.g. at an enemy)