Of course the person who ships animals via any mail service has to ensure proper conditions. So don't ship animals when the weather is either to hot or too cold

Of course the person who ships animals via any mail service has to ensure proper conditions. So don't ship animals when the weather is either to hot or too cold, and of course proper packaging is important too. Some species, like aquarium shrimps, can easily be sent by mail as long as the temperatures are ok, but for example in Germany, there also exists delivery services who specialize on animal transport. They guarantee over night delivery and also keeping the animals away from heat or cold.