Vaquita

I'd not heard of this animal until I was doing research into endangered species.

They are the most endangered marine animal in the world. 

According to the Marine Mammal Centre 

Vaquitas are only found in the shallow waters of the northern Gulf of California, Mexico. This area is abundant in fish and shrimp, and many people depend on fishing for their livelihood. Most fishers in the area, whether they are legally catching fish and shrimp or illegally fishing for totoaba, use a type of net called a gillnet. Gillnets are the primary reason for the vaquita’s decline.

The Environmental Investigation Agency

The vaquita is not hunted in its own right – it is collateral damage, killed accidentally in the illegal gillnets set primarily for totoaba fish, the dried swim bladders, or maw, of which are highly sought-after in China.

 

They drown because they get tangled in the nets!