wild mushrooms in bishan park

came across these mushrooms in a compost heap at bishan park ii. was so tempted to collect some because they looked like the edible type.

however, i remember reading somewhere that poisonous mushrooms usually look similar to the edible type. the rule of the thumb - if animal can eat it, so can you - should not be applied here. even if a squirrel eats it, it does not mean that you can eat it with no ill effects. and it is not true that all white mushrooms do not contain toxin.