Question: Are Bee trees and Epigaea both hollow?

Context articles: Trinidad dog-like bat
Megachile rotundata
Mixer Tavern
Epigaea
Bee tree
Mason bee
Xylocopa valga
Xylocopa latipes
Bee Sellers Hollow
Melipona quadrifasciata

The Trinidad dog-like bat ("Peropteryx trinitatis") is a species of bat from the family Emballonuridae.
 It is native to Aruba, French Guinea, Grenada, Trinidad and Tobago, and Venezuela.
 The bat is considered to be rare everywhere in its geographic range, although this may be untrue, as the Trinidad dog-like bat was previously confused with the lesser dog-like bat.
 It is an aerial insectivore that roosts in hollow trees, hollow rotten logs on the ground, under overhanging banks, and caves in the Llanos of Venezuela.
Megachile rotundata, the alfalfa leafcutter bee or leafcutter bee is a European bee that has been introduced to various regions around the world.
 As a solitary bee species, it does not build colonies or store honey, but is a very efficient pollinator of alfalfa, carrots, other vegetables and some fruits.
 Because of this, farmers often use "M. rotundata" as a pollination aid by distributing "M. rotundata" prepupae around their crops.
 Each female will construct and provision her own nest, which is built in old trees or log tunnels.
 Being a leafcutter bee, these nests are lined with cut leaves.
 These bees feed on pollen and nectar and display sexual dimorphism.
 This species has been known to bite and sting, however it poses no overall danger unless it is threatened or harmed and its sting has been described as half as painful as a honey bee's.
The Mixer Tavern is a historic tavern, now a private residence, at 14 Westford Road in Ashford, Connecticut.
 It is a 2-1/2 story wood frame structure, five bays wide, with a side gable roof and center chimney.
 It is set at the northeast corner of Pompey Hollow Road and United States Route 44, and faces Pompey Hollow Road behind a thick screen of trees.
 Additions extend the size an additional two bays to the west, and also to the rear.
 The oldest portions of the building are traditionally dated to 1710, when John Mixer purchased the property (then 100 acre , now just 13), and applied for a license to operate a tavern.
 In addition to well-preserved vernacular 18th-century architecture (including a significant number of interior features), it is the only known tavern to operate in what is now Ashford for many years.
 It underwent a significant restoration effort in the 1920s.
Epigaea is a genus comprising three species of flowering plants in the Ericaceae.
 The species are small creeping shrubs that are typically anywhere from 10 to tall at full growth, forming large patches.
 The leaves are evergreen, alternate and simple, ranging amongst the three species from 2 to long.
 The flowers are small, white or pink, with a five-lobed tubular corolla which is produced in mid-spring.
 The fruit is a dry capsule with numerous small seeds.
A bee tree is a tree in which a colony of honey bees makes its home.
 A colony of bees may live in a bee tree for many years.
 Most bee trees have a large inner hollow, often with an upper and lower entrance.
Mason bee is a name now commonly used for species of bees in the genus Osmia, of the family Megachilidae.
 Historically, the term mason bee has also been used to describe bees of Chalicodoma and Megachilidae, most notably in "The Mason-Bees" by Jean-Henri Fabre and his translator Alexander Teixeira de Mattos in 1914.
 Mason bees are named for their habit of using mud or other “masonry” products in constructing their nests, which are made in naturally occurring gaps such as between cracks in stones or other small dark cavities; when available some species preferentially use hollow stems or holes in wood made by wood-boring insects.
Xylocopa valga is a species of carpenter bee common to: western, central and southern Europe, except for far northern latitudes; the Caucasus; Middle East; Central Asia; and Mongolia.
 The solitary bee has a black and blue coloured body, 20–27 mm in length, and densely covered with purple hairs.
 The small wings also have a purple tint.
 The bee creates cavity nests by gnawing the wood in the trunks of dead trees and in old wooden structures.
 It inhabits both forests and urban areas.
Xylocopa latipes, the tropical carpenter bee, is a species of carpenter bee widely dispersed throughout Southeast Asia.
 As its name suggests, this bee inhabits forests in warm tropical climates and constructs nests by burrowing into wood.
 It often makes long deep tunnels in wooden rafters, fallen trees, telephone poles and the like, but is not found in living trees.
Bee Sellers Hollow is a tributary of Fishing Creek in Columbia County, Pennsylvania, in the United States.
 It is approximately 1.8 mi long and flows through Stillwater.
 The watershed of Bee Sellers Hollow has an area of 1.58 sqmi .
 The stream is not considered to be impaired.
 The surficial geology in the area consists mainly of bedrock, along with alluvium, colluvium, Illinoian Till, and Illinoain Lag.
Melipona quadrifasciata is a species of eusocial, stingless bee of the order Hymenoptera.
 It is native to the southeastern coastal states of Brazil where it is more commonly known as which means "beautiful guard," as there is always a bee at the narrow entrance of the nest.
 "M. quadrifasciata" constructs mud hives in the hollows of trees to create thin passages that only allow one bee to pass at a time.
 Because they are stingless bees, "M. quadrifasciata" is often used as pollinators in greenhouses, outperforming honey bees in efficiency and leading to overall larger yields of fruits that were heavier, larger, and contained more seeds.