Part of the issue is that tribal groups themselves don't always believe their languages are endangered until they are down to the last handful of speakers.
If waters are not well flushed and sufficiently deep, feeding the caged fish can lead to excessive accumulation of nutrients and wastes, which endangers the balance necessary to sustain wild populations.
The driver who said he was paid $500 to deliver the cubs to the border with Laos faces charges of illegal possession and trafficking of an endangered species.
Although impure liquid hydrazine doesn't explode, it can certainly boil vigorously and spray hot and chemically toxic liquid around, which can endanger the safety of people nearby.
And though great whites are considered a vulnerable but now endangered species, they appear to be vanishing from the areas around a popular surfing beach in South Africa and in this case that's not a good thing.
Deforestation is common in Brazil as areas are cleared for farmland, pasture land and logging but it's also endangered a wide range of plant and animal species there apparently including the Spix's macaw.