What critically endangered freshwater crocodile, once widespread across Southeast Asia, survives in a few Thai wetlands?

• A Siamese crocodile ✓
• B Saltwater crocodile
• C False gharial
• D Chinese alligator

The Siamese crocodile (Crocodylus siamensis) is critically endangered in the wild, with remnant populations in Thailand's Pang Sida and Kaeng Krachan national parks.