Skip to main content
. 2009 Jun 29;4(6):e6070. doi: 10.1371/journal.pone.0006070

Figure 1. Ultrasound image showing an egg in the uterus of echidna 5D5E on July 23 2008.

Figure 1

Fertilization probably occurred on July 9, but she had fresh sperm in her reproductive tract and was also torpid. Distance between the two markers showing the structure within the egg is 0.35 cm.