zpravodajství životního prostředí již od roku 1999

100 years ago: woolly bear caterpillars obey the law

03.09.2017
Příroda
Originally published in the Manchester Guardian on 4 September 1917September 3"Woolly bears," in a fearful hurry, race across the road; they look as if they meant business or feared the wheel of passing vehicle or heedless boot. But the caterpillar knows nothing of danger, but merely acts as heredity has taught it; it must obey laws or go under in the struggle. Most insects need a wide distribution, for too restricted a feeding area may bring famine or degeneration; in one or other of their stages insects must get to a distance from congested districts or from ravaged food-plants. Naturally this distribution or migration takes place with many insects when, in their perfect stage, they are provided with wings, but some moths are slow-flying and lethargic, too busy with nectar-sipping and egg-laying to travel far, and in these the caterpillars make the journeys, getting over as much ground as they can before they find it necessary to spin cocoons. Related: Why gardeners should protect caterpillars Continue reading...
Zdroj: The Guardian

Komentáře k článku. Co si myslí ostatní?
Další zprávy z internetu




Další články
Chystané akce
ASIO, spol.s r.o.
24
11. 2017
24.11.2017 - Ostatní akce
od 09:30 do cca 11:00, na YouTube
UŽITEČNÉSEMINÁŘE.CZ
28
11. 2017
28.11.2017 - Seminář, školení
Praha,
Konferenční centrum CITY - Pankrác
ASIO, spol.s r.o.
15
12. 2017
15.12.2017 - Ostatní akce
od 09:30 do cca 11:00, na YouTube
Vodní zdroje Ekomonitor
6
2. 2018
6-7.2.2018 - Konference
hotel DAP, Praha
Podněty ZmapujTo
Mohlo by vás také zajímat
Naši partneři
Složky životního prostředí