The sheet can be brought up around the animal and tied together to contain the animal for transport if a box is not handy. Or the animal and the sheet can also be placed directly inside a cardboard box. Be careful not to leave a sheet or blanket on top of a bird because it may over heat. For hard to catch birds or larger birds, use either the box or sheet method. If the sheet method is used, place the bird in a cardboard box, then unwrap the bird as soon as possible so the bird doesn't overheat.
Birds can overheat very easily and die from being wrapped up too long, especially in warm weather.
They can also overheat in your hands, so don't hold an adult bird in your hands for any longer than necessary. If you need to use a net to catch the bird, use extreme caution because it may damage the feathers. If you're catching a raptor or a bird of prey, use leather gloves in addition to a towel or sheet to protect yourself from the bird's talons. Do not keep a bird of any kind wrapped in a blanket or any type of material for long periods of time. It is not recommended to put wild birds in wire cages because the cages may damage their feathers.