live birth

For humans and most other mammals, sex is a question is chromosomes. Two X chromsomes makes us female while an X and a Y makes us male. Birds use a similar but reversed system, where males are ZZ and females are ZW. But for reptiles, including crocodiles, turtles and many lizards, sex is determined not by genes, but by temperature.  In crocodiles, males hatch from eggs incubated at cooler temperatures while warmer conditions produce females. In turtles, it's the other way around, and lizards use a variety of criteria including some very complicated combinations of genes, temperature and…

The Japanese public watched in fascination last month as the first manta ray birth in captivity was broadcast nationwide from the Okinawa Churaumi Aquarium. Adult manta rays are large with ,Aeuwingspans,Aeu up to 25,Aeo across. However, baby manta rays are hardly guppies, emerging from their mother after a 374 day gestation period with a 6,Aeo wingspan. Wrapped like a burrito, the baby manta pops out and instinctively begins to beat its fins. Live manta birth from Japanese television Unlike other rays whose mouths are on the underside of their bodies, manta ray's mouths are forward facing.…