Birds play a crucial role in ecosystems and are among the key targets for biomonitoring. However, traditional methods face limitations, particularly when monitoring small, secretive, migratory species or those in hard-to-reach places. Challenges related to managing field observations, adverse weather conditions, and variations in observer expertise can distort data or even render analysis impossible. Environmental DNA (eDNA) is a noninvasive, cost-effective, and high-throughput tool for biodiversity assessment that has been gaining popularity in bird monitoring. While its most notable successes are in ichthyofaunal studies, eDNA analysis has recently gained traction in ornithology. However, targeted eDNA studies on birds remain relatively rare due to insufficient methodological testing. As of early 2025, available data suggest that eDNA has significant potential for studying bird biodiversity and ecology. eDNA-based methods have proven effective in detecting a wide range of avian species, including waterfowl, near-water birds, and even species not directly associated with aquatic environments, such as pollinators. This article provides an overview of eDNA applications for bird detection across various ecosystems, from tropical forests to polar regions. It examines eDNA use in both aquatic and terrestrial environments, with a focus on species detection and biodiversity assessment. Particular attention is given to eDNA metabarcoding as the most promising approach for enhancing the efficiency of bird biomonitoring studies.