Bird eggs range in colors and can be ornately maculated with spots, blotches and scrawls. They vary in shape and size, and they must be thick enough to withstand the weight of an incubating parent but ...

Meet the recognizable and beloved northern cardinal. Get cardinal bird facts, including why male cardinals are red, and where ...

Birds exhibit a wide variety of fascinating nesting and offspring-rearing behaviors throughout their lifecycle. Against the odds, they protect and guide their young from hatching to leaving the nest ...

Forest plot of the mean effect size (hatching failure percentage) estimates and 95% confidence intervals for each factor level for six moderators: threat status, IUCN Red List classification, ...