January 24, 2011 9:34 pm Animal Behaviorist Explains Your Pet's Quirks Penn Vet animal behaviorist Carlo Siracusa answers your questions about why some pets act so strange. US & World Videos 6:33 Family affair: Former Eagle and new Eagle Jeremiah Trotter and Jeremiah Trotter Jr. speak out 0:20 Teen girl shot in Southwest Philly, suspect in custody 0:27 FBI inspects American Airlines plane at PHL after bomb threat 1:40 Penn officials urging pro-Palestinian protesters to pack up and leave campus 2:17 Clear the Shelters: Meet Tails