Capturing footage of secretive animals can be very difficult. Like the pangolin. They are very shy animals and usually only come out at night. So they can be very hard to document and research. They key element to capturing animals you can't see very often is patience. Some people waited months to capture a few minute footage of the Siberian Tigers. They had to set up camera traps and had to wait in these little boxes for long periods of time before they got footage of the big cats.