● Relocatable object file (.o file)○ Code and data that can be combined with other relocatable object files to form executable object file■ Each .o file is produced from exactly one source (.c) file● Executable object file (a.out file)○ Code and data that can be copied directly into memory and then executed● Shared object file (.so file)○ Special type of relocatable object file that can be loaded into memory and linked dynamically, at either load time or run-time

● Symbol resolution○ Programs define and reference symbols (global variables and functions)○ Linker associates each symbol reference with exactly 1 symbol definition● Relocation○ Merges separate code and data sections into single sections○ Relocates symbols from relative locations in .o files to final memory locations○ Updates all references to symbols to reflect new positions

These species represent not only different types of movement (on land, in air, in water) but also different types of relocation data (from visual observations of individually marked animals to GPS relocations to relocations obtained from networked sensor arrays).