Cat. Hummingbirds also smack into our windows and are hit by our cars. (They are so attracted to red they may kill themselves hitting the glass pane separating them from a red flower in a greenhouse. They will chase red cars. A woman with a scarlet Chevy Suburban reported that immature hummingbirds would probe for nectar in the cracks of its hood.) And because they are all lung and so small, hummingbirds are extremely vulnerable to our pollutants and poisons. Brenda has seen all too many hummingbirds poisoned by common garden pesticides, for which there is no antidote.