Elder Sloth (ヨキカナ Yokikana) is an enemy introduced in Into the Future, Chapter 3.
Elder Sloth is the Alien variant of THE SLOTH, with significantly faster movement.
Like his regular variant, he has long range, high health, high damage, and a long time between attacks. The biggest difference is that his movement speed is six times faster than that of the original SLOTH. He also has longer range and a 100% chance to knock back your cat units.
To kill this enemy you need long range cats to snipe this creature (Saki, Nyandam, Cosmo, etc).
If you have Aphrodite this enemy is a joke, because of her longer range and masive damage to aliens.