Bird anatomy Birds have a four-chambered heart, in common with mammals, and some reptiles (mainly the crocodilia). This adaptation allows for an efficient nutrient and oxygen transport throughout the body, providing birds with energy to fly and maintain high levels of activity. A ruby-throated hummingbird's heart beats up to 1200 times per minute (about 20 beats per second). Many birds possess a muscular pouch along the esophagus called a crop. The crop functions to both soften food and regulate its flow through the system by storing it temporarily. The size and shape of the crop is quite variable among the birds. Members
Tobacco pouch Tobacco pouch A tobacco pouch is a pouch used to hold tobacco. They are often made out of leather, and once were made of sealskin. Rolling and pipe tobacco is often sold in a plastic pouch. The person who purchases the tobacco, if they own a tobacco pouch, will then transfer the tobacco from the plastic pouch to their leather one. Tobacco pouches date back to traditional Japan, and appear in artwork dating back to the 17th century. They were also made in Canada in the early 1900s. A tobacco pouch is a vital clue in the Sherlock Holmes short