Table 2 List of mentioned strategies used in bird trapping and frequency of citations of each
Method | Description | Used to catch | Number of citations |
|---|---|---|---|
Alçapão | A cage-like trap made of wood, metal and fiber. It can only be opened on top. The main mechanism is set off by pressure; as the bird reaches the flooring of the trap, the mechanism goes off and lowers the upper lid, entrapping the bird | All types of avian species. Sometimes smaller species do not have enough weight to set off the closing mechanism and larger species cannot enter the trap, allowing those to escape | 24 |
Visgueira | A type of natural glue extracted from jackfruit sap. It is typically applied in branches or twigs close to natural bodies of water. Often the glue can harm the entrapped bird when removing it from the trap | Smaller avian species. The glue is not strong enough to entrap larger species | 12 |
Esbarro | A cage-like trap made of wood, metal and fiber. It can be opened at all sides, allowing birds coming from any direction to enter. As the bird touches the inside of the trap the main mechanism goes off, closing all sides of the trap simultaneously | All types of avian species, especially larger ones. Sometimes smaller species do not have enough weight to set off the closing mechanism, allowing those to escape | 8 |
Chama | A captured bird that serves as bait to catch a particular species. Normally, it is located inside a small cage attached to a larger trap. It is especially effective to use a female of the desired species or a male when the desired species present territorial behavior | All types of avian species that can be attracted by other individuals from the same species or territorial species that tend to attack other avian species | 5 |
Mirror | A piece of mirror located on the flooring of a trap that is set off by pressure, such as an alçapão. Seeing its own reflection in the mirror, the bird approaches the trap as if it was another individual | All types of avian species that can be attracted by other individuals from the same species or territorial species that tend to attack other avian species | 2 |
Recorder | A recording of the desired species vocalization, usually reproduced by a smartphone nearby a trap | All types of avian species that can be attracted by another individual’s vocalization | 1 |