Warmer air and higher humidity leads to less air density, should not lead to smaller wings.
Plus, let’s see “bird size” data from the warm period called The Medieval Warm Period. Called that by everyone except the UN Warmists, who took the inconvenient warmth off their database.
“The Medieval Warm Period”
They’ve now calling it the Medieval Warm Anomaly. And back in the Jurassic Era, hummingbirds were as big as semi trucks.