The peace-loving pachyderm and lager promoter was an icon of successful conservation, say officials.
Explosions have rocked capital Caracas as the US says it captured Venezuela's President Nicola Maduro.
The US president earlier said if peaceful protesters are killed, Washington "will come to their rescue".
Bodies of two Swiss women aged 21 and 16, and two Swiss men aged 18 and 16 have been returned to their families.
