If you hit $0 Avail. funds for trading, your account will go into a margin call and Ameritrade will force you to sell positions or deposit money. I'm going to assume your Account Balance isn't -8.1k because you would have hit a margin call long before your account went negative unless this all happened overnight.
Sadly, these peaceful animals may not survive into the next century. Ape conservationists say time is running out, as there are only about 720 mountain gorillas left in the world, and the majority of gorilla populations are plummeting.
There are two separate populations of mountain gorillas, each of which live in their own small patch of afromontane forest about 40 km from each other. The forests were once connected. However, it is believed that they became separated about 500 years ago by people clearing the forests for wood and farmland.