![非プレミアムユーザ向け画像](https://djyfuxp9hxlrq.cloudfront.net/wp-content/uploads/2018/05/16135716/shutterstock_586397693-1.jpg)
Familiar animals and insects we often see have lesser-known habits. For example, dogs, which are the most familiar animals for humans, have a
keen sense of smell, but their sense of taste has not developed. In particular, they are not good at
detecting salty tastes. Also, dogs lived in groups in ancient times.