Dozens of dehydrated birds fall from the sky every day in the western state of Gujarat, India, when the heat in the country dries up water sources.
In response, veterinarians and animal rescuers feed the birds multivitamin tablets and inject water into their mouths with syringes.
Scientists link the early onset of intense summer with climate change.
Over the past few weeks, rescuers have brought in dozens of birds, such as pigeons or kites, treating thousands of birds daily, say doctors at an animal hospital in Ahmedabad.
Manoj Bhausar, who works closely with the hospital’s non-profit Jivdaya Charitable Trust, said: “This year has been one of the worst in recent times. We are seeing a 10% increase in the number of birds to be rescued.”
Health officials in Gujarat have advised hospitals to set up special wards for heat stroke and other heat-related illnesses due to rising temperatures.
India was the hottest March in more than 100 years, and in April in many places, including New Delhi, recorded unusually high temperatures exceeding 40C (104F) on most days.
Since the end of March, more than two dozen people have died from suspicions of heat stroke, and demand for electricity has reached a multi-year high.