Blast Hornet, known as Explose Horneck (エクスプローズ・ホーネック) in Japan, is a hornet-based Reploid that appears as a boss in Mega Man X3. He is a Maverick Hunter who was infected by the Sigma Virus to serve the Doppler Army.
Obviously, don't nominate any human characters. Hybrids like Cheetah or The Lizard are okay, as are shapeshifters with one set animal form (eg Professor McGonagall.)
