What are the main behavioral or biological differences between reptiles and mammals?
user
Well, reptiles are cold-blooded, so they’re more sensitive to changes in temperature than mammals. Mammals have the ability to maintain their own body temperature even in cold weather, so that makes it easier for them to adapt to colder environments. In general, their life spans are shorter, and their bodies are more flexible.
assistant
What are the main behavioral or biological differences between reptiles and mammals?
user
Here’s a quick breakdown I put together:  
Reptiles:

Cold blooded, meaning their body temperature is regulated by the outside environment, which makes it very hard to stay warm (they need to bask in the sun)
Have teeth at the front of the mouth that can be used to seize and hold prey
No neocortex, which means their brains are smaller and have fewer connections than mammals do
Some species have live births
Some species lay eggs
Mammals:

Warm-blooded, so their body temperature is regulated internally
Have teeth at the rear of the mouth, used to bite and tear apart food
Have neocortex, which means their brains are large and have many connections
Mammary glands which allow for lactation (the production of breast milk)
All mammals have live births
All mammals have hair
assistant
What are the main behavioral or biological differences between reptiles and mammals?