Small, compact swallow. Often forages over water for flying insects. Sometimes nests in caves, but more commonly found under bridges or other structures in the U.S. Makes a nest out of dried mud. Distinguished from most swallows by square tail and pale orange rump. Similar to Cliff Swallow, but note Cave's orange forehead and paler throat. Dramatically increasing in Texas. Vagrants turn up in Northeast U.S. in late fall, after most other swallows have departed.