Are you a Tarantula hobbyist? If so, we invite you to join our community! Once you join you'll be able to post messages, upload pictures of your pets and enclosures and chat with other Tarantula enthusiasts. Sign up today!
So a little while ago I noticed on my juvenile B.Boehmei this little line of darkness. He/she stopped eating 3 months ago and during my time with it ate twice
To my understanding that little line of darkness is the equivalent of it's heart.
The whole bald spot will turn shiny looking, then dark when in pre molt.