Canaries and most small pet birds can consume vegetables taken directly from the refrigerator, but it's generally better to bring the vegetables to room temperature before offering them to your bird. The cold temperature of the food won't necessarily impact their health negatively, but birds, like canaries, are more likely to eat and enjoy foods that are closer to their body temperature.
Here are a few reasons why you should consider allowing the vegetables to warm up a bit before serving them to your canary:
Palatability: Birds, like humans, often prefer food that is closer to their body temperature. Cold vegetables might be less appealing to your canary, and they may be more likely to eat them if they are at room temperature.
Digestion: Cold foods might not be as easily digestible for some birds. By allowing the vegetables to come to room temperature, you can make it easier for your canary's digestive system to process the food.
Comfort: Offering food at a more natural temperature can also be a matter of comfort for your pet. Birds are ectothermic, which means they rely on external sources of heat to regulate their body temperature. Providing slightly warmer foods can be more comforting for them.
To bring the vegetables to room temperature, you can take them out of the refrigerator and let them sit for a little while, or you can soak them briefly in warm water. Avoid using a microwave to warm the vegetables, as this can create hot spots and may overheat the food, making it unsafe for your bird.
Remember that introducing new foods to your canary's diet should be done gradually. If you are offering vegetables for the first time, observe how your bird reacts to them and ensure they do not show any signs of aversion or digestive issues. If you're unsure about which vegetables are safe for your canary or how to introduce them into their diet, consult with an avian veterinarian or an experienced bird owner.