If you are on foot, ignore them. They have good HP and spit poison; If you plan to take it down with a mount, use Hazmat Suit Hats or be ready to pump yourself Medical Brews, also backpedal to minimize the damage done to your headgear.
For any new players going into Aberration... The Portal is the easiest spawn point yes, there is a good spot for Berry gathering and Stone, Thatch, and Wood. However, be wary that Basilisk's will spawn in that area occasionally. Be prepared and watch for the tail poking out of the ground. I recommend you spawn at Fertile Lake 2. Good luck Survivers