Which of the following is a sign of a birth defect in rabbits?

Splayed legs is a recognized sign of a birth defect in rabbits. This condition occurs when the legs are unable to position themselves correctly under the body, leading to a wide stance and difficulty in movement. Splayed legs can result from various factors, including genetic issues, poor positioning in the womb, or nutritional deficiencies in the mother during pregnancy.

In contrast, heavy fur coats, long ears, and bright eyes do not indicate defects. Heavy fur coats may be related to the breed or environmental adaptations and do not signify any health issues. Long ears are also breed-specific traits and vary among different rabbit breeds; they are not indicative of any defects. Bright eyes generally suggest good health and vitality in rabbits.