Mangrove pit viper blue luminescence

Mangrove pit viper blue luminescence snake.
2022 Jun 10th @ Pasir Ris Mangrove Boardwalk.
This is the first time sighiting a blue pit viper. 
Though looked black from far, we can see the blue tint on its chin. 

Mangrove pit viper blue luminescence.
2022 Jun 10th @ Pasir Ris Mangrove Boardwalk.

 

Mangrove pit viper blue luminescence.
2022 Jun 10th @ Pasir Ris Mangrove Boardwalk.

Mangrove pit viper blue luminescence.
2022 Jun 10th @ Pasir Ris Mangrove Boardwalk.

Mangrove pit viper blue luminescence.
2022 Jun 10th @ Pasir Ris Mangrove Boardwalk.