Ex Compressum adds a bunch of Baits that can either be placed to force an animal spawn, as long as some environmental conditions are fulfilled.
Baits are generally crafted by putting two of the items related to an animal in a crafting grid. Note that the Squid Bait is disabled by default, and will therefore only be craftable if it is enabled in the configuration.
For a bait to result in an animal spawn, a few conditions must be fulfilled. You can see whether your environment is suitable by right-clicking the bait.
Baits that are ready to spawn an animal will also have smoke particles going off from them.
Even once the conditions are fulfilled, it can take anywhere up to three minutes (or longer if you're really unlucky) for the spawn to occur.