useless trivia: What Word Means: Thick - Stupid?

Questions

The most venomous of all snakes, known as the Inland Taipan, has enough venom in one bite to kill more than 200,000 ----------?

There are fewer than 1,000 Bactrian camels left in the wild. They have survived in a land with no water in an area used for nuclear testing. Their numbers, however, are falling dramatically as humans encroach farther and farther into China's ----------?

The mouse is the most common mammal in the ----------?

The dog and the turkey were the only two domesticated animals in ancient ----------?

There are ---------- that nest in trees. These creatures may spend their whole life without ever touching the ground.?