What physical tendency necessitates secure vertical containment for active Yokohama birds?
Answer
Tendency toward activity and sometimes flight.
Yokohama chickens are described as being relatively light-bodied birds with an alert demeanor, characteristics that contribute to a natural inclination toward being active. This activity sometimes manifests as a propensity for flight. Because of this tendency, owners must ensure that any enclosure built to house them provides sufficient vertical security, such as a roof or sufficient height, to effectively keep the birds contained and prevent accidental escapes.

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Ayam Yokohama Chicken Growth Time Lapse Day 1 to ... - YouTube
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