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.
The western lowland gorilla travels more than the other gorilla groups, averaging more than half a mile a day in search of food. Mountain Gorilla Diet The rarest of the groups, mountain gorillas live between 7,000 and 13,000 feet in the mountains of western Africa. Their favorite food appears to be bamboo, but mountain gorillas also eat many other types of plants. Due to their habitat, fruit is rare and makes up a very small portion of their diet.