Virtually all of the major bedding manufacturers have either gone totally to that design, abandoning the two-sided design, or have allotted a healthy percentage of their products to it. mattress construction appears to be a one-sided issue
Bird Spider and Bird Eating Spiders. The Chinese bird spiders are venomous spiders capable of delivering a rather dangerous bite. Their LD50-value is low and in the same range as many loxosceles species (brown recluse spiders). Chinese bird spiders are tarantulas, just like the goliath bird eating spider is a tarantula. Chinese bird spiders are widely distributed in Asia and are abundant in Southern China.
Some of the largest species of tarantula may weigh over 85 grams (3 oz); the largest of all, the goliath birdeater (Theraphosa blondi) from Venezuela and Brazil, has been reported to attain a weight of 170 grams (6.0 oz) and a leg-span of up to 30 centimetres (12 in), males being longer and females greater in girth.