The American Ornithology Foundation recently released a report on the state of birds in the United States. They believe that global warming is prompting birds to adjust their biological clock and advance the spawning period, and the above changes will make these birds unable to provide enough food for their newly hatched offspring. For example, blue crowned tits mainly feed on the larvae of moths and butterflies, but the spawning period of moths and butterflies is not advanced accordingly
The average temperature in the UK has been rising in the last 40 years.
premature blue crowned tits starve for days after breaking their shells.