What happened to Texas' birds during the big freeze? FacebookTwitterEmail 1of8 Feathers shield this yellow-rumped warbler from the cold.Kathy Adams Clark / Kathy Adams Clark/KAC ProductionsShow MoreShow Less 2of8 Northern cardinals used bird feeders during the recent freeze to convert food into energy to maintain core body temperature.Kathy Adams Clark / Kathy Adams Clark/KAC ProductionsShow MoreShow Less 3of8 4of8 This rufous hummingbird is no stranger to cold weather on its breeding grounds in Alaska but it migrates to Houston for mild winters.Kathy Adams Clark / Kathy Adams Clark/KAC ProductionsShow MoreShow Less 5of8 Birds like this yellow-rumped warbler have intertwined arteries and veins in their legs to protect their feet in the cold.Kathy Adams Clark / Kathy Adams Clark/KAC ProductionsShow MoreShow Less