Dart Traps
From WikiRaider
Dart Traps are the first traps Lara encounters in Tomb Raider, they can be found in many of the games afterwards.
When Lara follows the footprints of wolves in the first Level of Tomb Raider 1, she will come past the first set. They are not poisonous. You can identify them by the slots in the walls. They can be found throughout Peru.
There are two ways to get past. Either just run past or swandive over them. The last method is far to complicated to get right.
Also in Tomb Raider 3 tribesmen can fire blowpipe darts
In Tomb Raider 3 Dart Traps can be poisonous. But fortunately since Tomb Raider 3, In most cases you can crawl underneath them.
