from experiance, generaly they wont, i now use big open top jars for my betta's but in the past i have used a 4.5l bells wiskey bottle... worked a treat too, but chose to change too wider jars cos i now have more space... never had a betta get stuck in a bottle in five years i've had too many betta's and had a fair few in bottles....
nice collection but close ups of the fish would be nicer!!!!