A complete field guide and laboratory manual for shell collectors, with descriptions and lovely watercolour illustrations of every species of freshwater mollusc found in Canada. Clarke's identification keys and descriptions are extremely useful identification tools. Clarke also deals with mollusc ecology and our relationship to molluscs. 1981
Three leading coastal geologists provide a guidebook to North Carolina beach characteristics created specifically to enhance trips to the beach for tourists and residents. Original.
有一只淡水龟穿过两根直插入沙的细长直桩,原来是一只大蓝鹭的双腿。这孤零零的大蓝鹭,每晚都从三英里外的群栖地飞来岛上捕食。它不动声色地站着,脖子向后弯曲,倚着肩膀。若有鱼群疾窜过它的腿边,它那长嘴便伺机戳出。产卵的母龟游入深水时,一只小鲻鱼受惊 ...
Originally published in 1948 with 570 species listed, this reference has grown over the years. The previous edition (1991) listed 2,428 species, while this sixth edition, which now includes Mexico...
Freshwater Prawn Farming: A Manual for the Culture of Macrobrachium Rosenbergii
Of the Discussions and Proceedings of Two Workshops Held in Galveston, Tex., Oct. 8-11, 1975 and in Charleston, S.C., June 14-15, 1976.
水下植物有数千种之多,主要以藻类为主。海藻一般可分为两类:一类是营浮游生活的浮游藻类;一类是底栖藻类。海藻种类繁多,常见的海藻有绿藻、红藻和褐藻等,此外,还有一类巨藻,高者可达百米以上,是不折不扣的“藻中之王”。此外,海藻在浅水中常密生成片。
A comprehensive guide to the whales of the world and where to see them. Every year, more than four million people go whale watching, and the numbers keep growing. This...
Zoologist Mark Carwardine spent an adventurous year criss-crossing the globe, from the North Atlantic to the South Pacific, in search of whales. He watched them from kayaks, fishing boats, a...
On September 4, 2006, Steve Irwin was killed by a stingray while filming at the Great Barrier Reef. Known as the "Crocodile Hunter," after his TV series of the same...
The first and only guide to cover all 790 species found in North America north of Mexico, from the almighty Chinook Salmon to the tiny but notorious Snail Darter. Here...